Question

我用android studio 0.1创建了一个启动画面，但是当我在手机（nexus s）上用usb在调试模式下测试时，图像没有显示...为什么？

这是MainActivity

package com.example.splash;

import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.os.Handler;
import android.view.Menu;

public class MainActivity extends Activity {

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

    Handler x = new Handler();
    x.postDelayed(new SplashHandler(), 7000);



}
class SplashHandler implements Runnable{

    public void run(){


     startActivity(new Intent(getApplication(), Main.class));
        MainActivity.this.finish();


    }


}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

这是Main

package com.example.splash;


import android.app.Activity;

public class Main extends Activity {   

}

这是Splash.xml

< ?xml version="1.0" encoding="utf-8"?>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  android:orientation="vertical"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent" android:background="@drawable/splash">

</LinearLayout>

Answer 1

不要使用应用程序上下文。要知道何时使用活动上下文和应用程序上下文请检查下面的链接，特别是commonsware的答案

When to call activity context OR application context?

我在帖子中测试了你的代码。它适用于我的设备samsung galaxy s3。只有我做的改变是在RelativeLayout中有一个imageview，并在onCreate（）中设置相同的图像。我还使用了活动上下文。除此之外你的代码还可以。

使用处理程序启动画面

public class Splash extends Activity {
private static final int SPLASH_TIME = 2 * 1000;// 3 seconds delay

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    ImageView iv= (ImageView) findViewById(R.id.imageView1);
    iv.setBackgroundResource(R.drawable.afor);
    try {
           new Handler().postDelayed(new Runnable() {

        public void run() {

            Intent intent = new Intent(Splash.this,
                MainActivity.class);
            startActivity(intent);

            Splash.this.finish();
        }     
    }, SPLASH_TIME);
        }

    } catch(Exception e){}
}
 @Override
public void onBackPressed() {
    this.finish();
    super.onBackPressed();
}
}

splash.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" android:background="#ffffaa">

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_centerInParent="true"
     />

 </RelativeLayout>

Answer 2

尝试更改

Class c extends Activity至Class c extends AppCompatActivity。

为我工作。

Answer 3

试试此代码

MainActivity

public class MainActivity extends Activity {

String EmpID;
int requestCode;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.splash);          
    Thread timer = new Thread() {
        public void run() {
            try {
                sleep(2500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                startActivity(new Intent(getApplication(), Main.class));
                 MainActivity.this.finish();
            }
        }
    };
    timer.start();
   }
}

Splash.xml 请记住，启动图片应为png

<?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:orientation="vertical" 
android:background="@drawable/splash">

为什么我的闪屏不显示图像？

3 个答案: