Question

我正在创建一个带有id的简单imageview并尝试在点击它时启动一个活动但是当我在模拟器中点击它时，应用程序崩溃并给我（等待或关闭应用提示）这是我的：

XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:orientation="vertical">

<ImageView
    android:id="@+id/about"
    android:layout_width="match_parent"
    android:layout_height="450dp"
    android:background="@color/colorPrimaryDark"
    android:src="@drawable/twoth" />

</LinearLayout>

这是我的java代码

public class MainUi extends AppCompatActivity {

    //Variables Declaration.
    private Button btn1, btn2, btn3, btn4;
    private ImageView img;


    //Called when the activity is first created.
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_ui);
        //Variables Initialization and OnClick Method


        img = (ImageView) findViewById(R.id.about);
        img.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {
                //Start another activity
                Intent myIntent = new Intent(MainUi.this, Query.class);
                startActivity(myIntent);
            }
        });


    }


}

Answer 1

等待或关闭＆＃39;这件事让我觉得在Query活动中有一些东西在主线程上做了很多工作。

尝试使用AsyncTask并将所有长时间运行的进程放在doInBackground部分中，然后在onPostExecute中处理响应。

我想这很大程度上取决于你实际在做什么，但是AsyncTask应该是一个好的开始。

Answer 2

这里是完整的代码，我添加了其余的代码，以防您可以从外部（Query）类处理它，而不是在Async Class中。

public class Query extends AppCompatActivity {
    private ArrayList<String[]> BB;
    private ArrayList<String[]> AA = new ArrayList<String[]>();
    private Socket socket = null;
    private ObjectInputStream in = null;
    private DataOutputStream out = null;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_query);
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }
        try {
            AA = new AsyncAction().execute().get();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            setTextViews();


        }
    }

    public void setTextViews() {
        View linearLayout = findViewById(R.id.info);
        for (int y = 0; y < AA.size(); y++) {
            // for (int x = 0; x < AA.get(0).length; x++) {}
            TextView name = new TextView(this);
            name.setText(AA.get(y)[0]);
            name.setId(y);
            name.setGravity(Gravity.CENTER);
            name.setTextSize(30);
            name.setPadding(0, 30, 0, 0);
            name.setTextColor(this.getResources().getColor(R.color.icons));
            name.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0));

            ProgressBar pb = new ProgressBar(this, null, android.R.attr.progressBarStyleHorizontal);
            Drawable drawable = pb.getProgressDrawable();
            drawable.setColorFilter(new LightingColorFilter(0xFF000000, this.getResources().getColor(R.color.colorPrimary)));
            pb.setProgress(100);

            final int finalY = y;
            name.setOnClickListener(new View.OnClickListener() {
                public void onClick(View arg0) {
                    Bundle b = new Bundle();
                    b.putStringArray("list", AA.get(finalY));
                    Intent i = new Intent(Query.this, Info.class);
                    i.putExtras(b);
                    startActivity(i);
                }
            });
            ((LinearLayout) linearLayout).addView(name);
            ((LinearLayout) linearLayout).addView(pb);

        }
    }


    private class AsyncAction extends AsyncTask<String, Void, ArrayList> {

        protected ArrayList doInBackground(String... args) {
            try {


                socket = new Socket(port, 8888);
                out = new DataOutputStream(socket.getOutputStream());
                in = new ObjectInputStream(socket.getInputStream());
//                action
                out.writeInt(2);
                try {

                    in = new ObjectInputStream(socket.getInputStream());
                    BB = (ArrayList<String[]>) in.readObject();


                    in.close();
                    socket.close();

                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            } catch (UnknownHostException e1) {
                e1.printStackTrace();
            } catch (IOException e1) {
                e1.printStackTrace();
            }


            return BB;//returns what you want to pass to the onPostExecute()
        }

        protected void onPostExecute(ArrayList result) {
            AA = result;

        }
    }
}

单击imageview时，android应用程序关闭，没有错误

2 个答案: