Get SensorManager PowerManager WindowManager Display Android example
private SensorManager mSensorManager;
private PowerManager mPowerManager;
private WindowManager mWindowManager;
private Display mDisplay;
// onCreate
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get an instance of the SensorManager
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
// Get an instance of the PowerManager
mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);
// Get an instance of the WindowManager
mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
mDisplay = mWindowManager.getDefaultDisplay();
setContentView(R.layout.main); // main.xml or your xml file name
}
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How change background color of View Android sample.
MainActivity.java
main.xml
MainActivity.java
public class MainActivity extends Activity {
TextView hTextView;
TableRow hTableRow;
Button hButton, hButtonStop;
private Handler mHandler = new Handler();
private int nCounter = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hTextView = (TextView)findViewById(R.id.idTextView);
hButton = (Button)findViewById(R.id.idButton);
hButton.setOnClickListener(mButtonStartListener);
hTableRow = (TableRow)findViewById(R.id.idTableRow1);
} // end onCreate
View.OnClickListener mButtonStartListener = new OnClickListener() {
public void onClick(View v) {
hTableRow.setBackgroundColor(Color.YELLOW);
}
};
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TableLayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/tableLayout1">
<TableRow android:id="@+id/idTableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:background="#5655AA">
<TextView
android:id="@+id/idTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</TableRow>
</TableLayout>
</LinearLayout>
Click to Android version combobox - drop down menu and select your version, which just using (have instaled). For example: You updated ADT by SDK manager, but forget to update Android version. You can use lower version from drop down menu, which using your project, or do update of Android by SDK manager.


How get application version, sdk version, package name defined in the AndroidManifest file programmically Android sample.
MainClass.java onCreate()
AndroidManifes.xml
MainClass.java onCreate()
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// in onCreate
PackageInfo pinfo = this.getPackageManager().getPackageInfo(getPackageName(), 0);
String sVersionCode = pinfo.versionCode; // 1
String sVersionName = pinfo.versionName; // 1.0
String sPackName = getPackageName(); // cz.okhelp.my_app
int nSdkVersion = Integer.parseInt(Build.VERSION.SDK); // 7
int nSdkVers = Build.VERSION.SDK_INT; // 7
}
AndroidManifes.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="//schemas.android.com/apk/res/android"
package="cz.okhelp.my_app"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Add_view_to_tableActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Android Emulator warning:[Accessibility] Missing contentDescription attribute on image
Workaround example code:
Workaround example code:
android:contentDescription="@string/desc"
<ImageView
android:id="@+id/imageViewOil"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="@string/desc"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="84dp"
android:src="@drawable/tank_silver" />
Integer, Float, String, List passed as reference in JAVA example source code:
// List passed as reference JAVA
List<Integer>list = new ArrayList<Integer>();
public void fc (List<Integer>listRef){
listRef.add(7);
listRef.add(5);
}
fc(list); // 7, 5
// String passed as reference JAVA
public void mutate(AtomicReference<Object> ref) { ref.set("Goodbye"); }
AtomicReference<Object> ref = new AtomicReference<Object>("Hello");
mutate(ref);
System.out.println(ref.get()); //Goodbye!
String s = (String) ref.get();
// Integer passed as reference JAVA
private static void mutate(AtomicReference<Object> ref) { ref.set(7); }
//public static void main(String[] arg) {
AtomicReference<Object> ref = new AtomicReference<Object>(5);
mutate(ref);
System.out.println(ref.get()); // 7
int n = (Integer) ref.get();
// Float passed as reference JAVA
private static void mutate(AtomicReference<Object> ref) { ref.set(14.8f); }
//public static void main(String[] arg) {
AtomicReference<Object> ref = new AtomicReference<Object>(12.1f);
mutate(ref);
float f = (Float) ref.get();
System.out.println(f); //14.8
Editace: 2011-11-07 11:43:11
Počet článků v kategorii: 396
Url:get-sensormanager-powermanager-windowmanager-display-android-example