我想用一个按钮打电话。电话号码应该在里面。但我的密码不起作用。谁能支持？
public class mainactivity扩展appcompatactivity{private button；

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button button = (Button) findViewById(R.id.button);
}
public void onClickStart(View view) {
    button = findViewById(R.id.button);
    ((Button)findViewById(R.id.button)).setOnClickListener((View.OnClickListener) v -> {
        Intent callIntent = new Intent(Intent.ACTION_CALL);
        String phNum = "tel:" + "89261234567";
        callIntent.setData(Uri.parse(phNum));
        startActivity( callIntent) ;
    });
}

}

清单文件

<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.GateApp">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>