android - Android中进度条结束时如何更改 Activity ？

Question

我想在进度条结束后更改 Activity 。表示进度条线程结束。我在线程后添加 activity2。但是 activity2 在应用程序运行时启动。为什么会这样？

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        progressBar = (ProgressBar) findViewById(R.id.progressBar1);
        new Thread(new Runnable() {
            public void run() {
                while (progressStatus < 100) {
                    progressStatus += 1;
                    handler.post(new Runnable() {
                        public void run() {
                            progressBar.setProgress(progressStatus);
                        }
                    });
                    try {
                        Thread.sleep(20);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();


        Intent myIntent = new Intent(getApplicationContext(), activity2.class);
        myIntent.putExtra("key", "......"); //Optional parameters
        startActivity(myIntent);

Answer 1

您已经创建了一个新线程，它负责进度条，而在主线程上执行您的新 Activity 代码。您需要将启动 Activity 代码放在同一个线程中。

你可以做的是:

new Thread(new Runnable() {
    public void run() {
        while (progressStatus <= 100) {
                progressStatus += 1;
                handler.post(new Runnable() {
                    public void run() {
                        progressBar.setProgress(progressStatus);
                    }
                });
                try {
                    Thread.sleep(20);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        Intent myIntent = new Intent(getApplicationContext(), activity2.class);
        myIntent.putExtra("key", "......"); //Optional parameters
        startActivity(myIntent);
    }
}).start();