显示Toast消息

Question

我想从一个没有从中膨胀的View的类生成一个Toast。 我的课程有3节课。这些是：

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Intent screenIntent = new Intent(this, Screen.class);
    this.startActivity(screenIntent);

StartVoiceRecognition StartVoiceRecognitionChild = new StartVoiceRecognition();
    StartVoiceRecognitionChild.makeToast();
    }
}

,

public class Screen extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.screen);
    //species field
    tvSpecies = this.findViewById(R.id.textboxSpeciesxml);
    tvSpecies.setText(MainActivity.szSpecies);
    ...
    }
}

和

public class StartVoiceRecognition extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}
public void makeToast(Context context) {
    Toast.makeText(getApplicationContext(), "toast content here", Toast.LENGTH_SHORT).show();
    }
}

StartVoiceRecognition类中的Toast导致Screen类中的布局被破坏。如何在StartVoiceRecognition中放置Toast以便不会发生这种情况？

Answer 1

how to call toast from another class in android

将此方法放在另一个类中。通常我们将这些常用方法放在名为Utils的包中，然后，您可以在任何地方使用它。

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
StartVoiceRecognition.makeToast(this, "This is a Toast msg.");
    }
}

和

public class StartVoiceRecognition extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    }
public static void makeToast(Context mContext,String message){
    Toast.makeText(mContext, message, Toast.LENGTH_LONG).show();
    }
}