我开发了一个关于日食的应用程序来设置手机的壁纸。应用程序工作正常，但壁纸模糊。它是我项目中不可或缺的一部分。如果不解决这个问题，我无法继续进一步。
这是代码
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button =(Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent("com.example.backgroundapp.bakapp"));
}
});
}
@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;
}
}
The backapp java file
{
bakapp.java
public class bakapp extends Activity implements OnClickListener {
ImageView display;
int tophone;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// to our activity to cover the whole screen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.back);
Button but = (Button) findViewById(R.id.setwallpaper);
tophone = R.drawable.image4;
but.setOnClickListener(this);
display = (ImageView) findViewById(R.id.ivdisplay);
ImageView image1 = (ImageView) findViewById(R.id.IVimage1);
ImageView image2 = (ImageView) findViewById(R.id.IVimage2);
ImageView image3 = (ImageView) findViewById(R.id.IVimage3);
ImageView image4 = (ImageView) findViewById(R.id.IVimage4);
ImageView image5 = (ImageView) findViewById(R.id.IVimage5);
image1.setOnClickListener(this);
image2.setOnClickListener(this);
image3.setOnClickListener(this);
image4.setOnClickListener(this);
image5.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast var;
switch (v.getId()) {
case R.id.IVimage1:
display.setImageResource(R.drawable.n1);
var = Toast.makeText(bakapp.this, "image changed",
Toast.LENGTH_SHORT);
var.show();
tophone = R.drawable.n1;
break;
case R.id.IVimage2:
display.setImageResource(R.drawable.n2);
var = Toast.makeText(bakapp.this, "image changed",
Toast.LENGTH_SHORT);
var.show();
tophone = R.drawable.n3;
break;
case R.id.IVimage3:
display.setImageResource(R.drawable.n4);
var = Toast.makeText(bakapp.this, "image changed",
Toast.LENGTH_SHORT);
var.show();
tophone = R.drawable.n4;
break;
case R.id.IVimage4:
display.setImageResource(R.drawable.n5);
var = Toast.makeText(bakapp.this, "image changed",
Toast.LENGTH_SHORT);
var.show();
tophone = R.drawable.n5;
break;
case R.id.IVimage5:
display.setImageResource(R.drawable.n6);
var = Toast.makeText(bakapp.this, "image changed",
Toast.LENGTH_SHORT);
var.show();
tophone = R.drawable.n6;
break;
case R.id.setwallpaper:
// to set a background we need to use bitmap
InputStream is = getResources().openRawResource(tophone);
// to phone is a variable that is updated everytime we click on an
// ImageView to that imageview resource and by clicking the button
// we set the phone background to that image.
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap bm = BitmapFactory.decodeStream(is,null,options);
// decode inputstream is
try {
getApplicationContext().setWallpaper(bm);
// to set the wallpaper of the phone background we need to ask
// permission from the user so add permission of background from
// manifest file
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
var = Toast.makeText(bakapp.this, "Wallpaper image changed",
Toast.LENGTH_SHORT);
var.show();
break;
}
}
}
The layouts are as follows
main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Application to Change background picture of device"
android:textSize="30dp" />
<Button
android:id="@+id/button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="96dp"
android:text="Click to launch" />
</RelativeLayout>
Layout for bakapp.java
back.xml
<?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" >
<ImageView
android:id="@+id/ivdisplay"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_gravity="center"
android:src="@drawable/image4" />
"
<Button
android:id="@+id/setwallpaper"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="set image background" >
</Button>
<HorizontalScrollView
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_gravity="center" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/IVimage1"
android:layout_width="125dp"
android:layout_height="125dp"
android:padding="15dp"
android:src="@drawable/n1" />
<ImageView
android:id="@+id/IVimage2"
android:layout_width="125dp"
android:layout_height="125dp"
android:padding="15dp"
android:src="@drawable/n2" />
<ImageView
android:id="@+id/IVimage3"
android:layout_width="125dp"
android:layout_height="125dp"
android:padding="15dp"
android:src="@drawable/n3" />
<ImageView
android:id="@+id/IVimage4"
android:layout_width="125dp"
android:layout_height="125dp"
android:padding="15dp"
android:src="@drawable/n4" />
<ImageView
android:id="@+id/IVimage5"
android:layout_width="125dp"
android:layout_height="125dp"
android:padding="15dp"
android:src="@drawable/n5" />
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>