Question

我的问题是进度对话框没有显示启动画面？可以解决这个问题，任何帮助都可以提前感谢！

public class Splash extends Activity
{

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

    Thread thread = new Thread(){
        @Override
        public void run() {
            try
            {
                sleep(3*1000);
                ProgressDialog progressDialog = new ProgressDialog(Splash.this);
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setMessage("wait");
                progressDialog.setCancelable(false);
                progressDialog.show();
            }catch (Exception e)
            {
                    e.printStackTrace();
            }finally {
                Intent i = new Intent(Splash.this,MainActivity.class);
                startActivity(i);
                finish();
            }
        }
    };thread.start();

}

}

Answer 1

public class Splash extends Activity {

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

 ProgressDialog progressDialog = new ProgressDialog(Splash.this);
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setMessage("wait");
                progressDialog.setCancelable(false);
                progressDialog.show();

    Thread thread = new Thread(){
        @Override
        public void run() {
            try
            {
                sleep(3*1000);

            }catch (Exception e)
            {
                    e.printStackTrace();
            }finally {
 progressDialog.dismiss();
                Intent i = new Intent(Splash.this,MainActivity.class);
                startActivity(i);
                finish();
            }
        }
    };thread.start();

}

}

Answer 2

因为你正在后台线程中更新UI .. 尝试使用

runOnUiThread(new Runnable.......)

或尝试将UI工作放在UI线程上。

Answer 3

你在线程内写的内容将在后台执行。你无法操纵后台线程中的任何UI元素。你应该从这段代码中得到一个错误，检查你的堆栈跟踪。我建议你从Thread中删除ProgressDialog的代码并将它放在Thread之前。

Answer 4

您应该从UI线程显示进度对话框。或者您可以使用runOnUiThread（...）方法。如果你必须从不同的线程中显示它，请在线程的内部运行方法中写入：

Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(new Runnable() {
    @Override
    public void run() {
        //add try catch
        sleep(3*1000);
        ProgressDialog progressDialog = new ProgressDialog(Splash.this);
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setMessage("wait");
        progressDialog.setCancelable(false);
        progressDialog.show();
    }
});

我建议您在活动中使用处理程序而不是睡眠。您也可以在代码中没有线程的情况下尝试：

Handler h = new Handler(Looper.getMainLooper())
h.postDelayed( new Runnable() {
            @Override
            public void run() {
                ProgressDialog progressDialog = new ProgressDialog(Splash.this);
                progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                progressDialog.setMessage("wait");
                progressDialog.setCancelable(false);
                progressDialog.show();
            }
        },
        (3*1000));

Splash Screen中的问题与progressDialog

4 个答案: