android - 我怎样才能摆脱 "Skipped Frames. Application may be doing too much work on it' 的主线程“错误

Question

我正在尝试运行构建我的应用程序的第一个示例，但在从主要 Activity 开始另一个 Activity 时遇到此错误。从 System.out 消息中，我可以看到 sendMessage() 方法由发送按钮的 onClick 调用，但从未调用显示消息 Activity 。

logcat 有这条消息 -

"03-20 08:56:52.278: I/Choreographer(868): Skipped 66 frames! The application may be doing too much work on its main thread." 

这会一直打印，直到我终止模拟器。

这是内存问题吗？我使用的是 4G Ram PC。

    MainActivity.java

    package com.example.firstproject;

    import android.os.Bundle;
    import android.app.Activity;
    import android.content.Intent;
    import android.view.Menu;
    import android.view.View;
    import android.widget.EditText;
    import com.example.firstproject.DisplayMessageActivity;

    public class MainActivity extends Activity {
    public final static String EXTRA_MESSAGE = "com.example.firstproject.MESSAGE";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /** Called when the user clicks the Send button */
    public void sendMessage(View view) { // Do something in response to button
        System.out.println("Send message is called");
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        EditText editText = (EditText) findViewById(R.id.edit_message);
        String message = editText.getText().toString();
        intent.putExtra(EXTRA_MESSAGE, message);
         System.out.println("message =" + message);
    }

}


DisplayMessageActivity.java
----------------------------

     package com.example.firstproject;

    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.widget.TextView;
    import android.support.v4.app.NavUtils;
    import android.annotation.SuppressLint;
    import android.annotation.TargetApi;
    import android.content.Intent;
    import android.os.Build;

    public class DisplayMessageActivity extends Activity {
    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        System.out.println("Hi Display is called");
        super.onCreate(savedInstanceState);
        // Get the message from the intent
        Intent intent = getIntent();
        String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
       // Create the text view 
        TextView textView = new TextView(this);
        textView.setTextSize(40);
        textView.setText(message); 
        // Set the text view as the activity layout 
        setContentView(textView);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:

            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}

AndroidManifest file


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.firstproject"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".DisplayMessageActivity"
            android:label="@string/title_activity_display_message"
            android:parentActivityName=".MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
    </application>

</manifest>

感谢任何帮助。

Answer 1

您似乎忘记了实际启动 DisplayMessageActivity；在 MainActivity.sendMesssage() 中添加 startActivity(intent)。另见 this .