android编程中的琐碎知识点汇总（4）

1.从SMS获取联系人信息

Java代码


ContactItem getContactByAddr(Context context, final SMSItem sms) {

Uri personUri = Uri.withAppendedPath(

ContactsContract.PhoneLookup.CONTENT_FILTER_URI, sms.mAddress);

Cursor cur = context.getContentResolver().query(personUri,

new String[] { PhoneLookup.DISPLAY_NAME },

null, null, null );

if( cur.moveToFirst() ) {

int nameIdx = cur.getColumnIndex(PhoneLookup.DISPLAY_NAME);

ContactItem item = new ContactItem();

item.mName = cur.getString(nameIdx);

cur.close();

return item;

}

return null;

}

2.从gallery获取图片并显示

Java代码


protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {

super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

switch(requestCode) {

case REQ_CODE_PICK_IMAGE:

if(resultCode == RESULT_OK){

Uri selectedImage = imageReturnedIntent.getData();

String[] filePathColumn = {MediaStore.Images.Media.DATA};

Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);

cursor.moveToFirst();

int columnIndex = cursor.getColumnIndex(filePathColumn[0]);

String filePath = cursor.getString(columnIndex);

cursor.close();

Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);

}

}

}

3.service 里面使用toast

Java代码


public class ConnectionService extends Service {

private Handler handler = new Handler();

public void restartConnection(){

int sleepTime = reconnectCounter * MIN_RECON_WAIT;

if (sleepTime > MAX_RECON_WAIT){

sleepTime = MAX_RECON_WAIT;

}

String msg = "The connection has been lost. Restart attempt will start in: " + sleepTime/1000 + " seconds";

(new Timer()).schedule(

new TimerTask() {

public void run() {

handler.post(new Runnable() {

public void run() {

Toast.makeText(getApplicationContext(), "msg", Toast.LENGTH_LONG).show();

reconnectCounter++;

this.startConnectionThread()

}

});

}

}, sleepTime);

}//end restartConnection

}//end ConnectionService

4.禁用webView 放大缩小

Xml代码


<meta content='width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;' name='viewport' />

<meta name="viewport" content="width=device-width" />

5.margin代码实现View周围空出距离

Java代码


extView tv = (TextView)findViewById(R.id.my_text_view);

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)tv.getLayoutParams();

params.setMargins(0, 0, 10, 0); tv.setLayoutParams(params);

6.内部类的使用

Xml代码


<view class="com.android.notepad.NoteEditor$MyEditText"

id="@+id/note"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@android:drawable/empty"

android:padding="10dip"

android:scrollbars="vertical"

android:fadingEdge="vertical" />

7.使用本地tomcat自己搭建服务器注意点：

Java代码


在模拟器上可以用10.0.2.2代替127.0.0.1和localhost

在局域网环境可以用 192.168.0.x或者192.168.1.x(根据具体配置)连接本机

8.反编译apk中的文件或者生成apk所用到的：

Java代码


事先声明必须使用相关工具

反编译xml为我们可以看懂的格式

java -jar AXMLPrinter2.jar ***.xml>***.txt

发编译classes.dex到当前目录的classout中

java -jar baksmali.jar -o classout/ classes.dex

编译classout下的文件为classes.dex

java -jar smali.jar classout/ -o classes.dex