Android之内容提供器ContentProvider的简单表示

如何通过ViewProvider得到手机联系人信息
首先，需要在Manifests里面添加权限：

<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>```xml**java代码：**<div class="se-preview-section-delimiter"></div>```javapublic class TestContentProvider extends Activity {    private Button mButton;    private TextView mTextPhoneValues;    private ContentResolver mResolver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.layout_content_provider);        mTextPhoneValues = (TextView) findViewById(R.id.text_phone_values);        mButton = (Button) findViewById(R.id.button_content_provider);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                mResolver = getContentResolver();                Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;                Cursor cursor = mResolver.query(uri,new String[]{ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME},null,null,null);                cursor.moveToFirst();                while(!cursor.isAfterLast()){                    String[] names = cursor.getColumnNames();                    StringBuffer buffer = new StringBuffer();                    for(String name:names){                        String value = cursor.getString(cursor.getColumnIndex(name));                        buffer.append("字段名："+name+"\t字段值："+value);                    }                    mTextPhoneValues.setText(mTextPhoneValues.getText()+buffer.toString()+"\n");                    cursor.moveToNext();                 }            }        });    }}

布局文件很简单，只需添加一个按钮，和一个用来呈现信息的TextView

<?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">    <Button        android:id="@+id/button_content_provider"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Provide Phone Number"/>    <TextView        android:id="@+id/text_phone_values"        android:layout_width="match_parent"        android:layout_height="wrap_content"/></LinearLayout>

结果演示：