Question

我想打开第一个活动，我想以意图关闭第一个活动。我尝试过这个，但是接收器不起作用。我的应用程序中有不同的接收器，所以我希望这个意图仅从FirstReceiver接收。我该怎么办？

public class First extends Activity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        Intent close = new Intent(getApplicationContext(), Close.class);
        startActivity(close);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.first, menu);
        return true;
    }

    class FirstReceiver extends BroadcastReceiver 
    {
        @Override
        public void onReceive(Context context, Intent intent) 
        {
            Log.e("FirstReceiver","FirstReceiver");
            First.this.finish();
        }
    }
}

这是第二堂课。

public class Close extends Activity 
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_close);
        Intent myIntent = new Intent();
        sendBroadcast(myIntent);
        Log.e("onCreate","onCreate");
        finish();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.close, menu);
        return true;
    }
}

Answer 1

这可能对你有帮助......

public class First extends Activity {
    public static final String ACTION_CLOSE = "yourPackageName.ACTION_CLOSE";
    private FirstReceiver firstReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        IntentFilter filter = new IntentFilter(ACTION_CLOSE);
        firstReceiver = new FirstReceiver();
        registerReceiver(firstReceiver, filter);
        Intent close = new Intent(getApplicationContext(), Close.class);
        startActivity(close);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.first, menu);
        return true;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(firstReceiver);
    }

    class FirstReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.e("FirstReceiver", "FirstReceiver");
            if (intent.getAction().equals(ACTION_CLOSE)) {
                First.this.finish();
            }
        }
    }
}

public class Close extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_close);
        Intent myIntent = new Intent(First.ACTION_CLOSE);
        sendBroadcast(myIntent);
        Log.e("onCreate", "onCreate");
        finish();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.close, menu);
        return true;
    }
}

Answer 2

因为最好使用startActivityForResult，onActivityRsult（）

 Intent in = new   Intent(getApplicationContext(), Close.class);
 startActivityForResult(in, RESULT_CLOSE);

并覆盖onActivityResult中的Activity并按此实施..

protected void onActivityResult(int requestCode, int resultCode, Intent data) {  

super.onActivityResult(requestCode, resultCode, data);     

 if (requestCode == RESULT_CLOSE){

       finish();
     }

如果要关闭mainActivity，请在关闭活动中调用setResult() ..

Answer 3

当用户希望退出所有打开的活动时，他们应该按下一个按钮，该按钮会加载应用启动时运行的第一个活动，在我的情况下为“关闭”。

Intent intent = new Intent(getApplicationContext(), Close.class);
intent.putExtra("EXIT", true);
startActivity(intent);

上述代码会清除除关闭以外的所有活动。关闭是用户运行程序时启动的第一个活动。然后将此代码放在关闭的onCreate中，以指示当“Exit”消息通过时它应该自毁。

if (getIntent().getBooleanExtra("EXIT", false)) {
    finish();
}

通过意图关闭来自其他活动的活动

3 个答案: