Android Studio 学习内容提供器 _学习内容

赋料扬雄敌，诗看子建亲。这篇文章主要讲述Android Studio 学习内容提供器相关的知识，希望能为你提供帮助。
运行时权限

使用ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.CALL_PHONE)!=PackageManager.PERMISSION_GRANTED//判断是否有权限
ActivityCompat.requestPermissions(MainActivity.this,
new String[] {Manifest.permission.CALL_PHONE},1); //没有权限进行申请
onRequestPermissionResult() //无论哪种结果都会回调到这个函数中所以重写这个函数

【Android Studio 学习内容提供器】makecallButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.
permission.CALL_PHONE)!=PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(MainActivity.this,
new String[] {Manifest.permission.CALL_PHONE},1);
else
call();
}
});
private void call()
{
try{
Intent intent = new Intent (Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:10086"));
startActivity(intent);
}
catch (SecurityException e)
{
e.printStackTrace();
}
}

@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { switch (requestCode){ case 1: if(grantResults.length > 0 & & grantResults[0]== PackageManager.PERMISSION_GRANTED) call(); else Toast.makeText(MainActivity.this,"you denied thepermission",Toast.LENGTH_LONG).show(); break; default: } }

}
查找联系人姓名和电话ListView contactsView = (ListView) findViewById(R.id.listview);
adapter = new ArrayAdapter
private void readContanct()
{
Cursor cursor = null;
try{
cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,null,null,null);
if(cursor != null)
while (cursor.moveToNext()){
String displayName = cursor.getString(cursor.getColumnIndex
(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String number =cursor.getColumnName(cursor.getColumnIndex
(ContactsContract.CommonDataKinds.Phone.NUMBER));
contactsList.add(number);
adapter.notifyDataSetChanged();
}
}
catch (Exception e)
{
e.printStackTrace();
}
finally {
if(cursor!=null)
cursor.close();
}
}