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[英]Android Emulator in Android Studio does not show my app
[英]The android studio AVD emulator does not show my app
我完成了一个简单的应用程序,该应用程序从“ Android编程,大书呆子牧场指南(第二版)”中学到了如何做,该应用程序除了问一个问题并等待答案外什么都不做,然后显示答案是否正确。烤面包。
所以我完成了应用程序,但是当我在android studio AVD模拟器上运行它时,在空的主屏幕上看不到任何内容
我是android的新手(实际上这是我有史以来第一个应用程序),所以我不太了解,大多数代码是自动生成的,但我了解其中的一些但无法编辑:
这是xml代码:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp"
android:text="@string/question_text"></TextView>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/true_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/true_button" />
<Button
android:id="@+id/false_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/false_button" />
</LinearLayout>
</LinearLayout>
这是Java代码(除了onCreate方法是自动生成的所有代码:
package com.bignerdranch.android.geoquiz;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.widget.Button;
import android.view.MenuItem;
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);
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();
}
});
mTrueButton = (Button) findViewById(R.id.true_button);
mFalseButton = (Button) findViewById(R.id.false_button);
mTrueButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Toast.makeText(QuizActivity.this, R.string.correct_toast, Toast.LENGTH_SHORT).show();
}
});
mFalseButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Toast.makeText(QuizActivity.this, R.string.incorrect_toast, Toast.LENGTH_SHORT);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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);
}
}
字符串资源xml文件:
<resources>
<string name="app_name">GeoQuiz</string>
<string name="action_settings">Settings</string>
<string name="question_text">Constantinople is the largest city in Turkey.</string>
<string name="true_button">True</string>
<string name="false_button">False</string>
<string name="correct_toast">Correct !</string>
<string name="incorrect_toast">Incorrect !</string>
</resources>
屏幕截图:
尝试先启动仿真器,然后运行项目。 由于该设备已启动并正在运行,它会提示您选择设备,然后选择它是否有帮助。
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