java - 非静态 setGravity 不能从静态上下文中引用

Question

我对 Android 开发非常陌生，但了解一点 Java。我不知道将 Toast.setGravity(Gravity.TOP,0,0) 放在代码中的何处。

代码如下:

package ca.ignitestudio.geoquiz;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class QuizActivity extends AppCompatActivity {

private Button mTrueButton;
private Button mFalseButton;


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



    mTrueButton = (Button) findViewById(R.id.true_button);
    mTrueButton.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT).show();
            Toast.setGravity(Gravity.TOP,0,0);
        }
    });
    mFalseButton = (Button) findViewById(R.id.false_button);
    mFalseButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(QuizActivity.this, R.string.incorrect_toast, Toast.LENGTH_SHORT).show();
        }
    });
}

}

Answer 1

您必须以这种方式调用 setGravity:

 Toast toast = Toast.makeText(test.this,"bbb", Toast.LENGTH_LONG);
    toast.setGravity(Gravity.CENTER, 0, 0);
    toast.show();