完成 BroadCast Receiver 的所有活动

Question

我想在屏幕关闭时从 BroadCast Receiver 完成所有应用程序活动：首先，我在我的活动中创建了一个静态引用，如下所示：

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {



public static AppCompatActivity ma;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //set instance of ma equals to MainActivity
    ma=this;


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }

    });
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {

    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is       present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
 @Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
public void displayView(int viewId) {

    Fragment fragment = null;
    String title = getString(R.string.app_name);

    switch (viewId) {
        case R.id.monthly_figures:
            fragment = new dailysales();
            title  = "Daily Figures";

            break;
        case R.id.nav_gallery:
            fragment=new monthlysales();
            title="Monthly Figures";
            break;


    }

    if (fragment != null) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.content_frame, fragment);
        ft.commit();
    }

    // set the toolbar title
    if (getSupportActionBar() != null) {
        getSupportActionBar().setTitle(title);
    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);

}

然后呼叫来自我的 BroadCastreceiver Class，如下所示：

public class SCBroadcaster extends BroadcastReceiver {
  public void onReceive(Context context, Intent intent) {
    if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
    MainActivity.ma.finish();
    }
  }
}

您认为还有其他更好的方法吗？我尝试调用 System.Exit(0) 或 process.killprocess(myPid) 但是当屏幕重新打开时，它将重新启动整个应用程序。谢谢

Answer 1

Android 没有为此做好设置。该框架的想法是应用程序永远不会关闭并且始终可以重新打开到同一位置。我认为这是个坏主意（出于安全原因，某些应用程序在超时后需要关闭），但这就是它的工作原理。

尽管我很讨厌他们，但我认为事件总线是到达这里的正确方式。让每个 activity 在 onCreate 中注册一个事件总线事件。让接收器在检测到屏幕关闭时发送事件（或您想要的任何其他触发器）。当 Activity 接收到该事件时，让它调用 finish()。为了使事情变得更简单，将此行为编码到基础 activity class 中，并让您的所有活动都从 class 而不是直接从 Activity 派生。

完成 BroadCast Receiver 的所有活动

Finish All Activities from BroadCast Receiver

java

android

broadcastreceiver

android-activity