java - 安卓工作室版本3.1.1

Question

将我的 android studio 更新到 3.1.1 后 我发现了图中的错误。 在我更新 android studio 之前一切都很好。

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class SetTimeActivity extends AppCompatActivity  {
    private  int TIME_IN_MINUTES ;
    private EditText et ;
    private Button mButtonStartPause;
    private Button mButtonReset;
    private CountDownTimer mCountDownTimer;
    private boolean mTimerRunning;
    private long mTimeLeftInMillis;
    private long mEndTime;
    DevicePolicyManager devicePolicyManager;
    ComponentName componentName;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_set_time);
        et = (EditText) findViewById(R.id.setTimerMenu_et);
        mButtonStartPause = (Button) findViewById(R.id.set_btn);
        devicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
        componentName = new ComponentName(SetTimeActivity.this, Controller.class);

Answer 1

尝试以下操作并检查它是否有效:

1. 尝试使缓存失效并重新启动。为此:

File -> Invalidate Caches and Restart

打开命令行并执行手动 gradle 构建:

./gradlew 干净组装

确保您的 build.gradle 中有以下内容:

compile "com.android.support:appcompat-v7:{latest}"