1. 创建类继承 UncaughtExceptionHandler

import android.content.Context;

import android.os.Environment;

import android.os.Looper;

import android.text.TextUtils;

import android.util.Log;

import android.widget.Toast;

import com.emh.pdavoicecall4.constant.Constants;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.io.Writer;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import java.util.Locale;

import androidx.annotation.NonNull;

public class MyCrashHandler implements Thread.UncaughtExceptionHandler {

private Context context;

private static final String APP_NAME = Constants.APP_PACKAGE_NAME;

private String logFilePath = Environment.getExternalStorageDirectory().getPath()

+ File.separator + APP_NAME + File.separator + "Log" + File.separator + "crashlog";

public MyCrashHandler(Context context) {

this.context = context;

}

@Override

public void uncaughtException(@NonNull Thread thread, @NonNull final Throwable ex) {

Log.e("程序出现异常", "Thread = " + thread.getName() + "\nThrowable = " + ex.getMessage());

String stackTraceInfo = getStackTraceInfo(ex);

Log.e("stackTraceInfo", stackTraceInfo);

saveThrowableMessage(stackTraceInfo);

new Thread() {

public void run() {

Looper.prepare();

Toast.makeText(context, ex.getMessage(), Toast.LENGTH_SHORT).show();

Looper.loop();

};

}.start();

}

private String getStackTraceInfo(final Throwable t) {

PrintWriter pw = null;

Writer writer = new StringWriter();

try {

pw = new PrintWriter(writer);

t.printStackTrace(pw);

} catch (Exception e) {

return "";

} finally {

if (pw != null) {

pw.close();

}

}

return writer.toString();

}

private void saveThrowableMessage(String errorMessage) {

if (TextUtils.isEmpty(errorMessage)) {

return;

}

File file = new File(logFilePath);

if (!file.exists()) {

boolean mkdirs = file.mkdirs();

if (mkdirs) {

writeStringToFile(errorMessage, file);

}

} else {

writeStringToFile(errorMessage, file);

}

}

private void writeStringToFile(final String errorMessage, final File file) {

FileOutputStream fos = null;

try {

String content = errorMessage + "[" + Utils.getCurrentDateTime() + "]\r\n";

ByteArrayInputStream bais = new ByteArrayInputStream(content.getBytes("UTF-8"));

File crashLog = createCrashLogFile(file);

fos = new FileOutputStream(crashLog, true);

int len = 0;

byte[] bytes = new byte[1024];

while ((len = bais.read(bytes)) != -1) {

fos.write(bytes, 0, len);

}

fos.flush();

Log.e("程序出现异常", "写入本地文件成功：" + file.getAbsolutePath());

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fos != null) {

try {

fos.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

private List getAllCrashFiles() {

File dir = new File(logFilePath);

File[] files = dir.listFiles();

List fileNames = new ArrayList<>();

for (int i = 0; i < files.length; i++) {

if (files[i].isFile()) {

fileNames.add(files[i].getName());

}

}

return fileNames;

}

private File createCrashLogFile(File file) throws IOException {

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd", Locale.CHINA);

String currentDate = sdf.format(new Date());

File crashLog = new File(file, currentDate + ".txt");

if (!crashLog.exists()) {

crashLog.createNewFile();

List crashLogNames = getAllCrashFiles();

if (crashLogNames.size() > 10) {

long currentTimeMilSeconds = new Date().getTime();

String earliestDate = sdf.format(new Date(currentTimeMilSeconds - 24 * 60 * 60 * 10 * 1000));

deleteFile(earliestDate + ".txt");

}

}

return crashLog;

}

private void deleteFile(String fileName) {

File file = new File(logFilePath + File.separator + fileName);

if (file.exists()) {

file.delete();

}

}

}

2. 创建类继承Application，初始化MyCrashHandler

import android.app.Application;

public class MyApp extends Application {

@Override

public void onCreate() {

// TODO Auto-generated method stub

super.onCreate();

MyCrashHandler handler = new MyCrashHandler(getApplicationContext());

Thread.setDefaultUncaughtExceptionHandler(handler);

}

}

3. 测试

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

private Button test_crash_btn;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

test_crash_btn = (Button) findViewById(R.id.test_crash_btn);

test_crash_btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

testThreadException();

}

});

}

private void testUIThreadException() {

String string = null;

char[] chars = string.toCharArray();

}

private void testThreadException() {

Thread thread = new Thread(new Runnable() {

@Override

public void run() {

int i = 0;

int s = 10 / i;

}

});

thread.start();

}

}