自定义全局异常捕捉—

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开发安卓的小伙伴都遇到过APP突然崩溃,无响应的情况.如果发生在自己手中,那么还可以通过IDE查看错误日志,但是实际都是发生在用户手中,那么这个时候产生崩溃,无响应ANR异常就很麻烦.无从下手.因此,需要全局异常捕获.也就是对未知异常,程序员没有处理的异常进行处理,记录等便于分析查找原因.

MyUncaughtExceptionHandler.java

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;

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.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.Locale;

/**
 * @ClassName MyUncaughtExceptionHandler
 * @Description 全局捕捉异常
 * @Author summerain0
 * @Date 2020/9/11 15:31
 */
public class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    // 单例
    private static MyUncaughtExceptionHandler myUncaughtExceptionHandler;
    // 上下文
    private Context context;
    // 会输出到文件中
    private StringBuilder stringBuilder;
    // 系统异常处理器
    private Thread.UncaughtExceptionHandler defaultUncaughtExceptionHandler;

    public MyUncaughtExceptionHandler(Context context) {
        this.context = context;
    }

    // 获取单例
    public static synchronized MyUncaughtExceptionHandler getInstance(Context ctx) {
        if (myUncaughtExceptionHandler == null) {
            myUncaughtExceptionHandler = new MyUncaughtExceptionHandler(ctx);
        }
        return myUncaughtExceptionHandler;
    }

    // 初始化
    public void init() {
        defaultUncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread thread, Throwable throwable) {
        if (throwable == null) {
            defaultUncaughtExceptionHandler.uncaughtException(thread, throwable);
        }

        // 创建集合对象
        stringBuilder = new StringBuilder();

        // 记录时间
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd_HH:mm:ss.SSS", Locale.getDefault());
        String date = simpleDateFormat.format(new Date());
        addMessage("崩溃时间", date);

        // 记录应用版本信息
        try {
            PackageManager pm = context.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);
            addMessage("版本名", pi.versionName);
            addMessage("版本号", pi.versionCode);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            addMessage("error", "记录版本信息失败！" + e.getMessage());
        }

        // 记录设备信息
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                Object obj = field.get(null);
                if (obj != null) {
                    addMessage(field.getName(), obj);
                }
            } catch (IllegalAccessException e) {
                e.printStackTrace();
                addMessage("error", "记录设备信息失败！" + e.getMessage());
            }
        }

        // 添加分隔符
        addMessage(null, "==============================================================");
        addMessage(null, "========================   崩溃日志   =========================");
        addMessage(null, "==============================================================");

        // 记录崩溃信息
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        throwable.printStackTrace(printWriter);
        Throwable cause = throwable.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        addMessage(null, writer.toString());

        // 生成路径，保存至/Android/data/包名，无需读写权限
        try {
            File root = context.getExternalFilesDir("log");
            String filename = date + ".log";
            File file = new File(root, filename);
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(stringBuilder.toString().getBytes());
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
            defaultUncaughtExceptionHandler.uncaughtException(thread, throwable);
        }
    }

    // 添加数据
    private void addMessage(String key, Object obj) {
        // 对数组做一下处理
        if (obj instanceof String[]) {
            String[] list = (String[]) obj;
            ArrayList&lt;String&gt; array = new ArrayList&lt;&gt;(Arrays.asList(list));
            stringBuilder.append(key).append("=").append(array.toString()).append("\n");
        }
        // 其他的都直接添加
        if (key == null) {
            stringBuilder.append(obj)
                    .append("\n");
        } else {
            stringBuilder.append(key)
                    .append("=")
                    .append(obj)
                    .append("\n");
        }
    }

}

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import android.content.Context;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.os.Build;

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.lang.reflect.Field;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Date;

import java.util.Locale;

/**

* @ClassName MyUncaughtExceptionHandler

* @Description 全局捕捉异常

* @Author summerain0

* @Date 2020/9/11 15:31

public class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {

// 单例

private static MyUncaughtExceptionHandler myUncaughtExceptionHandler;

// 上下文

private Context context;

// 会输出到文件中

private StringBuilder stringBuilder;

// 系统异常处理器

private Thread.UncaughtExceptionHandler defaultUncaughtExceptionHandler;

public MyUncaughtExceptionHandler(Context context) {

this.context = context;

}

// 获取单例

public static synchronized MyUncaughtExceptionHandler getInstance(Context ctx) {

if (myUncaughtExceptionHandler == null) {

myUncaughtExceptionHandler = new MyUncaughtExceptionHandler(ctx);

}

return myUncaughtExceptionHandler;

}

// 初始化

public void init() {

defaultUncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();

Thread.setDefaultUncaughtExceptionHandler(this);

}

@Override

public void uncaughtException(Thread thread, Throwable throwable) {

if (throwable == null) {

defaultUncaughtExceptionHandler.uncaughtException(thread, throwable);

}

// 创建集合对象

stringBuilder = new StringBuilder();

// 记录时间

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd_HH:mm:ss.SSS", Locale.getDefault());

String date = simpleDateFormat.format(new Date());

addMessage("崩溃时间", date);

// 记录应用版本信息

try {

PackageManager pm = context.getPackageManager();

PackageInfo pi = pm.getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES);

addMessage("版本名", pi.versionName);

addMessage("版本号", pi.versionCode);

} catch (PackageManager.NameNotFoundException e) {

e.printStackTrace();

addMessage("error", "记录版本信息失败！" + e.getMessage());

}

// 记录设备信息

Field[] fields = Build.class.getDeclaredFields();

for (Field field : fields) {

try {

field.setAccessible(true);

Object obj = field.get(null);

if (obj != null) {

addMessage(field.getName(), obj);

}

} catch (IllegalAccessException e) {

e.printStackTrace();

addMessage("error", "记录设备信息失败！" + e.getMessage());

}

// 添加分隔符

addMessage(null, "==============================================================");

addMessage(null, "======================== 崩溃日志 =========================");

addMessage(null, "==============================================================");

// 记录崩溃信息

Writer writer = new StringWriter();

PrintWriter printWriter = new PrintWriter(writer);

throwable.printStackTrace(printWriter);

Throwable cause = throwable.getCause();

while (cause != null) {

cause.printStackTrace(printWriter);

cause = cause.getCause();

}

printWriter.close();

addMessage(null, writer.toString());

// 生成路径，保存至/Android/data/包名，无需读写权限

try {

File root = context.getExternalFilesDir("log");

String filename = date + ".log";

File file = new File(root, filename);

FileOutputStream fos = new FileOutputStream(file);

fos.write(stringBuilder.toString().getBytes());

fos.close();

} catch (IOException e) {

e.printStackTrace();

defaultUncaughtExceptionHandler.uncaughtException(thread, throwable);

}

// 添加数据

private void addMessage(String key, Object obj) {

// 对数组做一下处理

if (obj instanceof String[]) {

String[] list = (String[]) obj;

ArrayList<String> array = new ArrayList<>(Arrays.asList(list));

stringBuilder.append(key).append("=").append(array.toString()).append("\n");

}

// 其他的都直接添加

if (key == null) {

stringBuilder.append(obj)

.append("\n");

} else {

stringBuilder.append(key)

.append("=")

.append(obj)

.append("\n");

}

MyApplication.java

import android.app.Application;

/**
 * @ClassName MyApplication
 * @Description TODO
 * @Author summerain0
 * @Date 2020/9/11 14:00
 */
public class MyApplication extends Application {
    public static final String TAG = "MyApplication";

    @Override
    public void onCreate() {
        super.onCreate();
        // 初始化异常处理器
        MyUncaughtExceptionHandler.getInstance(MyApplication.this).init();
    }
}

import android.app.Application;

/**

* @ClassName MyApplication

* @Description TODO

* @Author summerain0

* @Date 2020/9/11 14:00

public class MyApplication extends Application {

public static final String TAG = "MyApplication";

@Override

public void onCreate() {

super.onCreate();

// 初始化异常处理器

MyUncaughtExceptionHandler.getInstance(MyApplication.this).init();

}

AndroidManifest.xml

<application
        android:name=".MyApplication"
        ....>
</application>

<application

android:name=".MyApplication"

....>

</application>

自定义全局异常捕捉——保存至本地

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