Java Android 应用程序不会显示在 Android Studio 模拟器中
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Android App won't display in Android Studio Emulator
提问by user3388470
I am very new to Android development. I have tried to recreate an app where if you press a button, a message "new text string" is displayed. However, when I run the AVD and choose the Virtual Device, it doesn't display it. Just an old TestApp I had. Can anyone suggest a fix? I'd really appreciate it. My code:
我对Android开发很陌生。我试图重新创建一个应用程序，如果您按下按钮，则会显示一条消息“新文本字符串”。但是，当我运行 AVD 并选择虚拟设备时，它不会显示它。只是我拥有的一个旧的 TestApp。任何人都可以建议修复吗？我真的很感激。我的代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android= "http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:id="@+id/hello_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button android:id="@+id/trigger"
android:layout_width="100dip" android:layout_height="100dip"
android:text="@string/button1"
android:layout_below="@+id/hello_text"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="111dp" />
</RelativeLayout>
SimpleActivity.java
简单活动.java
package com.example.simpleactivityexample;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;
import android.widget.*;
import android.view.View;
public class SimpleActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Toast.makeText(this, "onCreate", Toast.LENGTH_SHORT).show();
Button startButton = (Button) findViewById(R.id.trigger);
startButton.setOnClickListener(new View.OnClickListener()
{
private TextView tv = (TextView) findViewById(R.id.hello_text);
public void onClick(View view)
{
tv.setText("new text string");
}
}
);
}
@Override
protected void onStart() {
super.onStart();
Toast.makeText(this, "onStart", Toast.LENGTH_SHORT).show();
}
@Override
protected void onResume() {
super.onResume();
Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();
}
@Override
protected void onRestart() {
super.onRestart();
Toast.makeText(this, "onRestart", Toast.LENGTH_SHORT).show();
}
@Override
protected void onPause() {
Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();
super.onPause();
}
@Override
protected void onStop() {
Toast.makeText(this, "onStop", Toast.LENGTH_SHORT).show();
super.onStop();
}
@Override
protected void onDestroy() {
Toast.makeText(this, "onDestroy", Toast.LENGTH_SHORT).show();
super.onDestroy();
}
}
Manifest
显现
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.simpleactivityexample" >
<application
android:debuggable="true"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.simpleactivityexample.SimpleActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="@string/app_name"
android:theme="@style/FullscreenTheme" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Strings.xml
字符串.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Dietary Application</string>
<string name="hello">Hello!</string>
<string name="button1">This is a button!</string>
</resources>
回答by Mesher
Your code seems fine; check the logcat and console outputs when you click 'Run as Android Application' to see if the install is working.
你的代码看起来不错；当您单击“作为 Android 应用程序运行”以查看安装是否正常时，请检查 logcat 和控制台输出。
Logcat is located in the top menu under
Logcat位于顶部菜单下
Window- Show View - Other - Android - Logcat
窗口-显示视图-其他-Android-Logcat
Also try cleaning the project and restarting the emulator; and also, if the app doesn't show up when the emulator loads, try, without exiting the emulator, to run it again.
还可以尝试清理项目并重新启动模拟器；此外，如果应用程序在模拟器加载时没有出现，请尝试在不退出模拟器的情况下再次运行它。
回答by Yaroslav Mytkalyk
Are you using the latest studio? Seems like an old bug
您使用的是最新的工作室吗？好像是个老bug
Error when running emulator in Android Studio
Try waiting until the emulator boots, and then run the project.
尝试等到模拟器启动，然后运行项目。
回答by user3388470
I managed to solve it.I am using Android Studio by the way. I went to the run tab at the top of the screen and went into ''Edit Configurations''. I then ticked ''Show chooser dialog''. I started the AVD and when it was fully started, A pressed the run function(green triangle) and it started on the Android. Thanks so much to everyone who helped!
我设法解决了它。顺便说一下，我正在使用 Android Studio。我转到屏幕顶部的运行选项卡并进入“编辑配置”。然后我勾选了“显示选择器对话框”。我启动了 AVD，当它完全启动时，A 按下运行功能（绿色三角形），它在 Android 上启动。非常感谢所有帮助过的人！
