如何在Android中实现自定义Crash Handler以记录崩溃信息？

接口。

接口。

import android.content.Context;
import android.os.Looper;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
public class CustomCrashHandler implements Thread.UncaughtExceptionHandler {
    private static final String CRASH_LOG_FILENAME = "crash_log.txt";
    private Context context;
    private Thread.UncaughtExceptionHandler defaultUEH;
    public CustomCrashHandler(Context context) {
        this.context = context;
        this.defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
    }
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        // 记录崩溃信息到文件
        saveCrashInfoToFile(e);
        // 显示提示信息
        showToast("很抱歉，程序出现异常，即将重启");
        // 重启应用
        restartApp();
        // 调用系统默认的异常处理器
        if (defaultUEH != null) {
            defaultUEH.uncaughtException(t, e);
        } else {
            System.exit(1);
        }
    }
    private void saveCrashInfoToFile(Throwable ex) {
        File path = new File(context.getExternalFilesDir(null), CRASH_LOG_FILENAME);
        try (FileOutputStream fos = new FileOutputStream(path, true);
             PrintWriter writer = new PrintWriter(fos)) {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
            writer.println("Time: " + format.format(new Date()));
            writer.println("Device: " + android.os.Build.MODEL);
            writer.println("OS Version: " + android.os.Build.VERSION.RELEASE);
            writer.println("App Version: " + context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName);
            writer.println("Exception: " + ex.toString());
            StringWriter sw = new StringWriter();
            ex.printStackTrace(new PrintWriter(sw));
            writer.println("StackTrace: " + sw.toString());
            writer.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private void showToast(final String message) {
        new Thread(() -> {
            Looper.prepare();
            Toast.makeText(context, message, Toast.LENGTH_LONG).show();
            Looper.loop();
        }).start();
    }
    private void restartApp() {
        Intent intent = context.getPackageManager().getLaunchIntentForPackage(context.getPackageName());
        if (intent != null) {
            context.startActivity(intent);
        }
    }
}

2.2 初始化CustomCrashHandler

在应用启动时，我们需要初始化CustomCrashHandler并将其设置为全局的默认异常处理器，通常可以在

import android.app.Application;
public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        // 初始化自定义Crash Handler
        CustomCrashHandler crashHandler = new CustomCrashHandler(this);
        Thread.setDefaultUncaughtExceptionHandler(crashHandler);
    }
}

<application
    android:name=".MyApplication"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 触发异常
        throw new RuntimeException("Test Crash");
    }
}