学习目的：1.了解权限及如何申请权限
1.了解权限及如何申请权限
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Button makeCall = (Button) findViewById(R.id.make_call);
makeCall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
Intent intent = new Intent(Intent.ACTION_CALL);//打电话
intent.setData(Uri.parse("tel:10086"));
startActivity(intent);
} catch (SecurityException e) {
e.printStackTrace();
}
}
});
```
```java
<uses-permission android:name="android.permission.CALL_PHONE" />
1 | Button makeCall = (Button) findViewById(R.id.make_call); |
但在高版本的Android系统会出错 权限问题 permission Denial 修改如下1
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45public class MainActivity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button makeCall = (Button) findViewById(R.id.make_call);
makeCall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//判断用户是否已授权 将返回值与PackageManager.PERMISSION_GRANTED比较
if(ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.CALL_PHONE)!=PackageManager.PERMISSION_GRANTED){
//申请授权 Activity实例 String数组 请求码
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();
}
}
//判断最后的授权结果
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case 1:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
call();
} else {
Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show();
}
break;
default:
}
}
}