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Android VideoView播放视频 今天的任务是所以先来记录一下VideoView经过一番操作之后，视频总算是放出来了而且这个只是本地的视频，我播放网络的视频总是出现然后报错2020-10-15 10:07:12.914 11984-11984/cn.lanol.studykongjian V/MediaHTTPService: MediaHTTPService(android.media.MediaHTTPService@37be89c): Cookies: null2020-10-15 10:07:12.916 11984-11984/cn.lanol.studykongjian E/MediaPlayerNative: Unable to create media player2020-10-15 10:07:12.918 11984-11984/cn.lanol.studykongjian W/VideoView: Unable to open content: https://gitlab.com/Vastsa/lanpicbed/-/raw/master/视频地址.mp4 java.io.IOException: setDataSource failed.: status=0x80000000 at android.media.MediaPlayer.nativeSetDataSource(Native Method) at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1175) at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1162) at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1079) at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1100) at android.widget.VideoView.openVideo(VideoView.java:412) at android.widget.VideoView.access$2200(VideoView.java:83) at android.widget.VideoView$7.surfaceCreated(VideoView.java:694) at android.view.SurfaceView.updateSurface(SurfaceView.java:1153) at android.view.SurfaceView.lambda$new$0$SurfaceView(SurfaceView.java:173) at android.view.-$$Lambda$SurfaceView$w68OV7dB_zKVNsA-r0IrAUtyWas.onPreDraw(Unknown Source:2) at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1093) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3089) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1952) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8171) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:972) at android.view.Choreographer.doCallbacks(Choreographer.java:796) at android.view.Choreographer.doFrame(Choreographer.java:731) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:957) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:223) at android.app.ActivityThread.main(ActivityThread.java:7656) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)2020-10-15 10:07:12.918 11984-11984/cn.lanol.studykongjian D/VideoView: Error: 1,0于是暂时先放弃了，反正比赛也是无网环境。起初播放本地视频也是如此，但后来发现是因为权限的原因，所以需要在AndroidManifest.xml中加入<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />然后还需要在Activity中动态申请权限int permission = ActivityCompat.checkSelfPermission(videoVIew.this, Manifest.permission.WRITE_EXTERNAL_STORAGE); if (permission != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(videoVIew.this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE); video.start(); }然后在提示授权的时候点击允许然后就没什么好说的了，这是Activity全部代码package cn.lanol.studykongjian; import android.Manifest; import android.content.pm.PackageManager; import android.os.Bundle; import android.os.Environment; import android.widget.MediaController; import android.widget.VideoView; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; public class videoVIew extends AppCompatActivity { private final int REQUEST_EXTERNAL_STORAGE = 1; private String[] PERMISSIONS_STORAGE = { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_video_view); //设置视频地址 String videoUrl1 = Environment.getExternalStorageDirectory().getPath()+"/onceok.mp4" ; //找到视频控件进行一系列设置 VideoView video = findViewById(R.id.video); video.setMediaController(new MediaController(this)); video.setVideoPath(videoUrl1); int permission = ActivityCompat.checkSelfPermission(videoVIew.this, Manifest.permission.WRITE_EXTERNAL_STORAGE); if (permission != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(videoVIew.this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE); video.start(); } } }-------------------------------------------------------------------播放URL视频提示Can't play this video的问题解决了，因为没有加网络权限，所以需要在AndroidManifest.xml中加入<uses-permission android:name="android.permission.INTERNET" />然后就是设置播放URLUri uri = Uri.parse("https://gitlab.com/Vastsa/lanpicbed/-/raw/master/播放地址.mp4") video.setVideoURI(uri); -
安卓MPAndroidChart绘制水平柱状图 这个和垂直柱状图一模一样，只不过把控件名换了一下从barchart换成了HorizontalBarChartXML文件<LinearLayout android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="水平柱状图" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="150dp" android:orientation="vertical"> <com.github.mikephil.charting.charts.HorizontalBarChart android:id="@+id/horizontalBarChart" android:layout_width="match_parent" android:layout_height="150dp" /> </LinearLayout>MainActivity//初始化水平柱状图 HorizontalBarChart horizontalBarChart = findViewById(R.id.horizontalBarChart); initBarChart(horizontalBarChart); horizontalBarChart.setData(setBarData()); barChart.invalidate(); public BarChart initBarChart(BarChart barChart) { barChart.setDrawBarShadow(false); // 设置每条柱子的阴影不显示 barChart.setDrawValueAboveBar(true); // 设置每条柱子的数值显示 barChart.setPinchZoom(false); XAxis xAxis = barChart.getXAxis(); // 获取柱状图的x轴 YAxis yAxisLeft = barChart.getAxisLeft(); // 获取柱状图左侧的y轴 YAxis yAxisRight = barChart.getAxisRight(); // 获取柱状图右侧的y轴 setAxis(xAxis, yAxisLeft, yAxisRight); //调用方法设置柱状图的轴线 return barChart; } public BarData setBarData() { List<BarEntry> entries = new ArrayList<>(); //定义一个数据容器 //生成随机数数据 for (int i = 0; i <= 12; i++) { entries.add(new BarEntry(i, new Random().nextInt(300))); } BarDataSet barDataSet = new BarDataSet(entries, "测试数据"); BarData barData = new BarData(barDataSet); return barData; //返回可用于柱状图的数据 }文章参考：https://blog.csdn.net/weixin_43344890/article/details/103008320
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安卓MPAndroidChart绘制多层级的堆叠条形图 这次是在上一篇的基础上增加的，所以导包这些啥的就跳过了研究了一下代码，发现主要的区别就在于增加data的时候，第二个参数传递的是一个数组，然后就变成了堆叠条形图。最后的代码：XML布局文件：<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="这是一个柱状图" android:gravity="center"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="150dp" android:orientation="vertical"> <com.github.mikephil.charting.charts.BarChart android:id="@+id/barChart" android:layout_width="match_parent" android:layout_height="150dp" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="这是一个堆叠条形图" android:gravity="center"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="150dp" android:orientation="vertical"> <com.github.mikephil.charting.charts.BarChart android:id="@+id/duiDieChart" android:layout_width="match_parent" android:layout_height="150dp" /> </LinearLayout> </LinearLayout>MainActivity，这里只把堆叠图的代码放出来了，之前的看上一篇文章public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { BarChart duiDieChart = findViewById(R.id.duiDieChart); duiDieChart.getDescription().setEnabled(false); duiDieChart.setMaxVisibleValueCount(40); // 扩展现在只能分别在x轴和y轴 duiDieChart.setPinchZoom(false); duiDieChart.setDrawGridBackground(false); duiDieChart.setDrawBarShadow(false); duiDieChart.setDrawValueAboveBar(false); duiDieChart.setHighlightFullBarEnabled(false); // 改变y标签的位置 YAxis leftAxis = duiDieChart.getAxisLeft(); leftAxis.setDrawGridLines(false); leftAxis.setAxisMinimum(0f); duiDieChart.getAxisRight().setEnabled(false); XAxis xLabels = duiDieChart.getXAxis(); xLabels.setDrawGridLines(true); xLabels.setPosition(XAxis.XAxisPosition.TOP); Legend l = duiDieChart.getLegend(); l.setVerticalAlignment(Legend.LegendVerticalAlignment.BOTTOM); l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.RIGHT); l.setOrientation(Legend.LegendOrientation.HORIZONTAL); l.setDrawInside(false); l.setFormSize(8f); l.setFormToTextSpace(4f); l.setXEntrySpace(6f); ArrayList<BarEntry> weiZhangZhanBi = new ArrayList<>(); for (int i = 0; i <= 5; i++) { float a = new Random().nextInt(400); float b = new Random().nextInt(400); weiZhangZhanBi.add(new BarEntry(i, new float[]{a, b})); } BarDataSet set1; if (duiDieChart.getData() != null && duiDieChart.getData().getDataSetCount() > 0) { set1 = (BarDataSet) duiDieChart.getData().getDataSetByIndex(0); set1.setValues(weiZhangZhanBi); duiDieChart.getData().notifyDataChanged(); duiDieChart.notifyDataSetChanged(); } else { set1 = new BarDataSet(weiZhangZhanBi, "年龄群体车辆违章的占比统计 "); set1.setColors(getColors()); set1.setStackLabels(new String[]{"有违章", "无违章"}); ArrayList<IBarDataSet> dataSets = new ArrayList<IBarDataSet>(); dataSets.add(set1); BarData data = new BarData(dataSets); data.setValueTextColor(Color.WHITE); duiDieChart.setData(data); } duiDieChart.setFitBars(true); duiDieChart.invalidate(); } }看着这篇文章来的：https://blog.csdn.net/qq_26787115/article/details/53323046
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安卓MPAndroidChart绘制柱状图 首先是添加Jar包进入Gradle Scripts的目录，添加Jar包都在这里首先是Project这个的allprojects里面加上一行allprojects { repositories { google() jcenter() maven { url "https://jitpack.io" } } }在app这个里面denpendencies中弄成这样子的dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'androidx.appcompat:appcompat:1.0.2' implementation 'androidx.constraintlayout:constraintlayout:1.1.3' testImplementation 'junit:junit:4.12' androidTestImplementation 'androidx.test.ext:junit:1.1.0' androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1' implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0' }然后这是xml布局文件<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:id="@+id/chart" android:layout_width="match_parent" android:layout_height="150dp" android:orientation="vertical"> <com.github.mikephil.charting.charts.BarChart android:id="@+id/barChart" android:layout_width="match_parent" android:layout_height="150dp" /> </LinearLayout> </LinearLayout>然后这是Mainactivity的代码package ink.cik.echartsstu; import android.os.Bundle; import android.os.Trace; import androidx.appcompat.app.AppCompatActivity; import com.github.mikephil.charting.charts.BarChart; import com.github.mikephil.charting.charts.LineChart; import com.github.mikephil.charting.components.Description; import com.github.mikephil.charting.components.XAxis; import com.github.mikephil.charting.components.YAxis; import com.github.mikephil.charting.data.BarData; import com.github.mikephil.charting.data.BarDataSet; import com.github.mikephil.charting.data.BarEntry; import java.util.ArrayList; import java.util.List; import java.util.Random; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //定义一下界面的控件 BarChart barChart = findViewById(R.id.barChart); initBarChart(barChart); //初始化一个柱状图 barChart.setData(setBarData()); //给柱状图添加数据 barChart.invalidate(); //让柱状图填充数据后刷新 } public BarData setBarData() { List<BarEntry> entries = new ArrayList<>(); //定义一个数据容器 //生成随机数数据 for (int i = 0; i <= 12; i++) { entries.add(new BarEntry(i, new Random().nextInt(300))); } BarDataSet barDataSet = new BarDataSet(entries, "测试数据"); BarData barData = new BarData(barDataSet); return barData; //返回可用于柱状图的数据 } public BarChart initBarChart(BarChart barChart) { barChart.setDrawBarShadow(false); // 设置每条柱子的阴影不显示 barChart.setDrawValueAboveBar(true); // 设置每条柱子的数值显示 XAxis xAxis = barChart.getXAxis(); // 获取柱状图的x轴 YAxis yAxisLeft = barChart.getAxisLeft(); // 获取柱状图左侧的y轴 YAxis yAxisRight = barChart.getAxisRight(); // 获取柱状图右侧的y轴 setAxis(xAxis, yAxisLeft, yAxisRight); //调用方法设置柱状图的轴线 return barChart; } public void setAxis(XAxis xAxis, YAxis leftAxis, YAxis rightAxis) { xAxis.setPosition(XAxis.XAxisPosition.BOTTOM); // 这里设置x轴在柱状图底部显示 xAxis.setAxisLineWidth(1); //设置x轴宽度 xAxis.setAxisMinimum(0); //设置x轴从0开始绘画 xAxis.setDrawAxisLine(true); //设置x轴的轴线显示 xAxis.setDrawGridLines(false);//设置x轴的表格线不显示 xAxis.setEnabled(true); // 设置x轴显示 leftAxis.setAxisMinimum(0); //设置y轴从0刻度开始 leftAxis.setDrawGridLines(false); // 这里设置左侧y轴不显示表格线 leftAxis.setDrawAxisLine(true); // 这里设置左侧y轴显示轴线 leftAxis.setAxisLineWidth(1); //设置y轴宽度 leftAxis.setEnabled(true); //设置左侧的y轴显示 rightAxis.setAxisMinimum(0); //设置y轴从0刻度开始 rightAxis.setDrawGridLines(false);// 这里设置右侧y轴不显示表格线 rightAxis.setDrawAxisLine(true); // 这里设置右侧y轴显示轴线 rightAxis.setAxisLineWidth(1); //设置右侧y轴宽度 rightAxis.setEnabled(true); //设置右侧的y轴显示 } }
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安卓在子线程传值给主线程，通过Handler传值 昨晚上在进行http请求获取数据并修改listview的时候遇到了一个问题Only the original thread that created a view hierarchy can touch its views大概意思就是：只有创建了视图层级的原始线程才可以修改这个视图于是我百度了一下，然后大概解决方案是这样子的，子线程通过handler传值给主线程，主线程接收后，再进行修改listview。Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 1) { Bundle data = msg.getData(); String val = data.getString("value"); //设置UI tvCode.setText(val); Log.i(TAG, "请求结果:" + val); } else if (msg.what ==0) { Toast.makeText(getApplicationContext(),"请求资源不成功",Toast.LENGTH_LONG).show(); } } }; /** * 处理网络请求的线程 */ private class RequestThread extends Thread { @Override public void run() { //网络请求 String string = 请求结果 Message msg = new Message(); Bundle data = new Bundle(); //将获取到的String装载到msg中 data.putString("value", string); msg.setData(data); msg.what = 1; //发消息到主线程 handler.sendMessage(msg); } } //点击事件启动新线程 public void test(View v){ new RequestThread().start(); }解决方法原链接：https://blog.csdn.net/LJX_ahut/article/details/89432576经过实践着实有用。获取前：获取后：MainActivity.java代码package ink.cik.logininfoapp; import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.net.wifi.aware.DiscoverySession; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.Adapter; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import java.util.ArrayList; import java.util.List; import ink.cik.logininfoapp.eneity.userInfo; import ink.cik.logininfoapp.help.httpHelper; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class MainActivity extends AppCompatActivity { private final Gson gson = new Gson(); @SuppressLint("HandlerLeak") Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 1) { Bundle data = msg.getData(); String val = data.getString("value"); List<userInfo> userInfoList = parseJson(val); ListView listView = (ListView) findViewById(R.id.listInfo); ArrayList<String> list = new ArrayList<String>();//数据源集合创建 for (userInfo userInfo : userInfoList) { list.add(userInfo.getUserName()); } ArrayAdapter<String> adapter = new ArrayAdapter<String>( MainActivity.this, android.R.layout.simple_list_item_1, list ); listView.setAdapter(adapter); } else if (msg.what == 0) { Toast.makeText(MainActivity.this, "数据获取失败，请检查网络！", Toast.LENGTH_SHORT); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button) findViewById(R.id.searchButton); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getAll(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu, menu); return true; } private void getAll() { final httpHelper httpHelper = new httpHelper(); new Thread(new Runnable() { @Override public void run() { try { String res = httpHelper.httpGet("https://api.565.ink/login/getAll?passwd=lanol666"); Log.d("结果：", res); Message msg = new Message(); Bundle data = new Bundle(); //将获取到的String装载到msg中 data.putString("value", res); msg.setData(data); msg.what = 1; handler.sendMessage(msg); } catch (Exception e) { e.printStackTrace(); } } }).start(); } private List<userInfo> parseJson(String JsonData) { Gson gson = new Gson(); List<userInfo> userInfoList = gson.fromJson(JsonData, new TypeToken<List<userInfo>>() { }.getType()); return userInfoList; } }
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Android在子线程显示Toast闪退，Can"t toast on a thread that has not called Loop 新建一个类toastHelppackage ink.cik.logininfoapp.eneity; import android.content.Context; import android.os.Looper; import android.widget.Toast; public class toastHelp { static Toast toast = null; public static void show(Context context, String text) { try { if (toast != null) { toast.setText(text); } else { toast = Toast.makeText(context, text, Toast.LENGTH_SHORT); } toast.show(); } catch (Exception e) { //解决在子线程中调用Toast的异常情况处理 Looper.prepare(); Toast.makeText(context, text, Toast.LENGTH_SHORT).show(); Looper.loop(); } } }然后需要用的时候直接调用toastHelp.show(LoginActivity.this, responseInfo.getInfo());
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利用okhttp3调用接口，用gson解析json数据 开心，总算搞好了调用接口获取所有用户信息，然后打印出来了。MainActivity.javapackage ink.cik.logininfoapp; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import androidx.appcompat.app.AppCompatActivity; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; import java.io.IOException; import java.util.List; import java.util.Map; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class MainActivity extends AppCompatActivity { private final Gson gson = new Gson(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button) findViewById(R.id.loginButton); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { EditText userName = findViewById(R.id.userName); EditText passWord = findViewById(R.id.passWord); Toast.makeText(MainActivity.this, userName.toString(), Toast.LENGTH_SHORT).show(); verLogin(); } }); } private void verLogin() { new Thread(new Runnable() { @Override public void run() { try { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url("https://api.565.ink/login/getAll?passwd=lanol666").build(); Response response = client.newCall(request).execute(); String responsedata = response.body().string(); Log.d("返回数据：", responsedata); parseJson(responsedata); } catch (IOException e) { e.printStackTrace(); } } }).start(); } private void parseJson(String JsonData) { Gson gson = new Gson(); List<userInfo> userInfoList = gson.fromJson(JsonData, new TypeToken<List<userInfo>>() { }.getType()); for (userInfo userInfo : userInfoList) { Log.d("信息：", userInfo.getUserName()); } } }userInfo.javapackage ink.cik.logininfoapp; public class userInfo { private int id; private String userName; private String passWord; private String nation; private int age; private String tel; public int getAge() { return age; } public String getNation() { return nation; } public int getId() { return id; } public String getPassWord() { return passWord; } public String getTel() { return tel; } public String getUserName() { return userName; } public void setAge(int age) { this.age = age; } public void setId(int id) { this.id = id; } public void setNation(String nation) { this.nation = nation; } public void setPassWord(String passWord) { this.passWord = passWord; } public void setTel(String tel) { this.tel = tel; } public void setUserName(String userName) { this.userName = userName; } }
