Android Api Demos登顶之路（五十七）Service Remote Service Binding options

<LinearLayout 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:orientation="vertical"
android:padding="5dp" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:textAppearance="?android:attr/textAppearanceMedium" />

<TextView
android:id="@+id/state"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Not Attached"
android:textAppearance="?android:attr/textAppearanceMedium" />

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:id="@+id/normal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Normal" />

<Button
android:id="@+id/not_foreground"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Not Foreground" />

<Button
android:id="@+id/above_client"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Above Client" />

<Button
android:id="@+id/oom_management"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Allow Oom Management" />

<Button
android:id="@+id/waive_priority"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Waive Priority" />

<Button
android:id="@+id/important"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Important" />

<Button
android:id="@+id/with_activity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Adjust With Activity" />

<Button
android:id="@+id/unbinding"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Unbind Service" />
</LinearLayout>
</ScrollView>

</LinearLayout>

public class MainActivity extends Activity implements OnClickListener {

private TextView mState;
private ServiceConnection mCurConnection;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mState = (TextView) findViewById(R.id.state);

Button normal = (Button) findViewById(R.id.normal);
Button not_foreground = (Button) findViewById(R.id.not_foreground);
Button above_client = (Button) findViewById(R.id.above_client);
Button oom_management = (Button) findViewById(R.id.oom_management);
Button waive_priority = (Button) findViewById(R.id.waive_priority);
Button important = (Button) findViewById(R.id.important);
Button with_activity = (Button) findViewById(R.id.with_activity);
Button unbinding = (Button) findViewById(R.id.unbinding);

normal.setOnClickListener(this);
not_foreground.setOnClickListener(this);
above_client.setOnClickListener(this);
oom_management.setOnClickListener(this);
waive_priority.setOnClickListener(this);
important.setOnClickListener(this);
with_activity.setOnClickListener(this);
unbinding.setOnClickListener(this);
}

class MyServiceConnection implements ServiceConnection {
public MyServiceConnection() {
}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// 如果当前的连接不是由本类创建的一个实例则不作处理
if (mCurConnection != this) {
return;
}
mState.setText("Attached!");
Toast.makeText(MainActivity.this, "已与服务器建立连接！", 0).show();
}

@Override
public void onServiceDisconnected(ComponentName name) {
if (mCurConnection != this) {
return;
}
mState.setText("Disconnected!");
Toast.makeText(MainActivity.this, "已与服务器断开连接！", 0).show();
}

}

private Intent intent = new Intent(IRemoteService.class.getName());
ServiceConnection conn = null;

private void unbindCurService() {
if (mCurConnection != null) {
unbindService(mCurConnection);
mCurConnection = null;
}
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.normal:
unbindCurService();
conn = new MyServiceConnection();
/*
* 当接收到连接的请求时，如果服务还未创建，则自动创建服务。当系统资源不足时，
* 当需要 销毁驻留该服务的进程时，服务才可能被销毁。
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE)) {
mCurConnection = conn;
}
break;
case R.id.not_foreground:
unbindCurService();
conn = new MyServiceConnection();
/*
* 所绑定的Service永远高不过前台的Activity
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_NOT_FOREGROUND)) {
mCurConnection = conn;
}
break;
case R.id.above_client:
unbindCurService();
conn = new MyServiceConnection();
/*
* 所绑定的Service优先级高于前台的Activity，当系统资源不足时会先杀死
* 客户端的activity再考虑杀死Service
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_ABOVE_CLIENT)) {
mCurConnection = conn;
}
break;
case R.id.oom_management:
unbindCurService();
conn = new MyServiceConnection();
/*
* 允许系统托管服务的优先级
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_ALLOW_OOM_MANAGEMENT)) {
mCurConnection = conn;
}
break;
case R.id.waive_priority:
unbindCurService();
conn = new MyServiceConnection();
/*
* 所绑定的Service不可调整自身的优先级
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_WAIVE_PRIORITY)) {
mCurConnection = conn;
}
break;
case R.id.important:
unbindCurService();
conn = new MyServiceConnection();
/*
* 当客户端在前台，这个标示符下的Service也变得重要性相当于前台的Activity，
* 优先级迅速提升
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_IMPORTANT)) {
mCurConnection = conn;
}
break;
case R.id.with_activity:
unbindCurService();
conn = new MyServiceConnection();
/*
* Service的优先级相对于与其绑定的Activity进行调整，当Activity运行在前台
* 则Service的优先级提升，当Activity运行在后台，则Service的优先级也相对降低
*/
if (bindService(intent, conn, Context.BIND_AUTO_CREATE
| Context.BIND_ADJUST_WITH_ACTIVITY)) {
mCurConnection = conn;
}
break;
case R.id.unbinding:
unbindCurService();
break;
}
}

}