Android实现消息通知的点击跳转查看，编写完整代码

以下是一个完整的 Android 实现消息通知的点击跳转查看的代码示例：

1. MainActivity.java

public class MainActivity extends AppCompatActivity {
    private static final String CHANNEL_ID = "my_channel";
    private static final int NOTIFICATION_ID = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        createNotificationChannel();

        // 创建一个 Intent
        Intent intent = new Intent(this, DetailActivity.class);
        intent.putExtra("message", "Hello World!");
        // 创建 PendingIntent
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        // 创建通知
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle("My notification")
                .setContentText("Hello World!")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                .setContentIntent(pendingIntent) // 设置 PendingIntent
                .setAutoCancel(true);

        // 显示通知
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        notificationManager.notify(NOTIFICATION_ID, builder.build());
    }

    private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            CharSequence name = getString(R.string.channel_name);
            String description = getString(R.string.channel_description);
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
            channel.setDescription(description);
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }
}

在上述代码中，我们创建了一个 NotificationCompat.Builder 对象，并将其与一个 PendingIntent 关联。当用户点击通知时，该 PendingIntent 会启动 DetailActivity，并传递了一个额外的字符串信息 "Hello World!"。

2. DetailActivity.java

public class DetailActivity extends AppCompatActivity {
    private TextView textViewMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail);

        textViewMessage = findViewById(R.id.textViewMessage);

        // 获取传递的额外信息
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String message = extras.getString("message");
            textViewMessage.setText(message);
        }
    }
}

在 DetailActivity 中，我们通过 getIntent().getExtras() 方法获取传递的额外信息，并更新了 UI。在这个例子中，我们将字符串信息显示在了一个 TextView 控件中。

3. activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click the notification to see the detail"
        android:textSize="20sp"
        android:gravity="center"/>

</LinearLayout>

4. activity_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    tools:context=".DetailActivity">

    <TextView
        android:id="@+id/textViewMessage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:gravity="center"/>

</LinearLayout>

以上就是一个完整的 Android 实现消息通知的点击跳转查看的代码示例。注意，为了确保 PendingIntent 能够正确启动指定的 Activity，并传递额外的信息，我们需要在 AndroidManifest.xml 文件中为 Activity 添加相应的声明和 Intent Filter。