Question

我想传递信息，如图screen description

所示

我知道我的代码正在运行，因为有一个Intent它可以完美运行。但是，当我尝试放两个或更多Intent时，它似乎搞砸了。我还检查here找到了一个sutibale解决方案，但我认为我不能以同样的方式使用它。提前致谢

- 更新 -

仍然没有工作

我在保存方面这样做了

 Intent saveIntent = new Intent(this, MainActivity.class);             
            SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
            editor.putString("time", displayTime.getText().toString());
            editor.commit();
            startActivity(saveIntent);

这是我的回忆

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        String time = preferences.getString("time",null);
        if (time != null)
           getTime.setText(time);

主要活动：

private Button createNewEvent;
private Button showMyEvents;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createNewEvent = (Button) findViewById(R.id.bCreateNewEvent);
showMyEvents = (Button) findViewById(R.id.bShowMyEvents);
 }

public void buttonOnClick(View v) {
     switch (v.getId()) {
        case R.id.bCreateNewEvent:
            Intent createNewEventIntent = new Intent(this,     CreateNewEventActivity.class);
            startActivity(createNewEventIntent);


            break;
        case R.id.bShowMyEvents:
            Intent myEventsIntent = new Intent(this,MyEventsActivity.class); 
          startActivity(myEventsIntent);

          break;
        }
    }
}

屏幕1保存按钮：

       case R.id.bSaveNewEvent:
      Intent putIntent = new Intent(getApplicationContext(),MyEventsActivity.class);
       // String  text = displayTime.getText().toString();
        putIntent.putExtra("time",displayTime.getText().toString());
        Intent saveIntent = new Intent(this, MainActivity.class);
        startActivity(saveIntent);
        startActivity(putIntent);

屏幕2 getExtras

 public class MyEventsActivity extends AppCompatActivity {
 TextView getTime;

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

getTime = (TextView) findViewById(R.id.tvGetTime);
Intent in = getIntent();
String name = in.getStringExtra("time");
getTime.setText(name);
   /* Bundle extras = getIntent().getExtras();
if (extras != null){
    getTime.setText(extras.getString("time"));

}*/

Answer 1

如果您尝试保存需要在其他多项活动中使用的数据，SharedPreferences将是最简单的解决方案。

https://developer.android.com/training/basics/data-storage/shared-preferences.html

如果要保存值，可以使用：

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
editor.putString("time", displayTime.getText().toString());
editor.commit();

然后，当您想稍后获得偏好时，您将使用：

SharedPreferences preferences = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE);
String time = preferences.getString("time", "");

将多个Intent传递给多个活动

1 个答案: