非静态setGravity不能从静态上下文中引用
我对android开发非常陌生,但知道一点Java。我有问题知道在我的代码中放置Toast.setGravity(Gravity.TOP,0,0)的位置。非静态setGravity不能从静态上下文中引用
下面的代码:
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();
}
});
}
}
你将不得不调用setGravity这样:
Toast toast = Toast.makeText(test.this,"bbb", Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
击败我约40秒。不应该浪费时间格式化我的代码... :) – Ginandi
谢谢你。这工作。我有正确的想法,但它是错误的。 –
setGravity
是不是一个静态方法,所以你应该叫setGravity
你吐司实例,即
Toast t = Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT);
t.setGravity(Gravity.TOP,0,0);
t.show();
这是一个40秒错过的投票:) –
您需要在实例上调用setGravity()
,而不是在类上。更改
Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT).show();
Toast.setGravity(Gravity.TOP,0,0);
到
Toast toast = Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP,0,0);
toast.show();
你可以标记'setGravity'为'static'例如'公共静态setGravity(..)'? –
不,我不能,因为如果我这样做会给我更多的错误。 –
那么makeText是如何工作的呢? –