Androidstudio案例之实现电话拨号

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 EditText phoneNum;
    ImageButton call_btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        phOneNum=(EditText) findViewById(R.id.phoneNum);
        call_btn=(ImageButton) findViewById(R.id.call_btn);
       call_btn.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Intent intent=new Intent();
               intent.setAction(Intent.ACTION_CALL);
               intent.setData(Uri.parse("tel:"+phoneNum.getText()));
               startActivity(intent);

protected boolean shouldAskPermissions(){
    return (Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP_MR1);
}

protected void askPermissions() {
    String[] permissiOns= {
            "android.permission.CALL_PHONE"
    };
    int requestCode = 200;
    requestPermissions(permissions, requestCode);
}

if(shouldAskPermissions()){
    askPermissions();
}