内容没有显示

所以，第二个活动的内容没有应用程序运行时，虽然内容是XML设计出出现。在Android Studio上使用Java进行编程。在类似的文章答案没有帮助。我也尝试过在第二个活动中放置一个元素，结果相同。提前致谢！内容没有显示

这是MainActivity.java代码：

package todo.beginner.com.carchooser2; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.Toast; 

import static todo.beginner.com.carchooser2.R.id.checkBoxPrice; 
import static todo.beginner.com.carchooser2.R.id.checkBoxGas; 
import static todo.beginner.com.carchooser2.R.id.checkBoxYear; 
import static todo.beginner.com.carchooser2.R.id.checkBoxMileage; 
import static todo.beginner.com.carchooser2.R.id.checkBoxCapacity; 

public class MainActivity extends AppCompatActivity { 
    private CheckBox check1, check2, check3, check4, check5; 
    private static Button button_next; 


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

    public void OnClickButtonListener() { 
     button_next = (Button)findViewById(R.id.button); 
     button_next.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         Intent intent = new Intent("todo.beginner.com.SecondActivity"); 
         startActivity(intent); 

        } 
       } 
     ); 


    } 

    public void addListenerToCeckBox() { 
     check1 = (CheckBox)findViewById(checkBoxCena); 
     check1.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         if (((CheckBox)v).isChecked()){ 
          Toast.makeText(MainActivity.this, 
            "Price is chosen", Toast.LENGTH_LONG).show(); 
         } 
        } 
       } 
     ); 
     check2 = (CheckBox)findViewById(checkBoxGads); 
     check2.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         if (((CheckBox)v).isChecked()){ 
          Toast.makeText(MainActivity.this, 
            "Year is chosen", Toast.LENGTH_LONG).show(); 
         } 
        } 
       } 
     ); 
     check3 = (CheckBox)findViewById(checkBoxTilpums); 
     check3.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         if (((CheckBox)v).isChecked()){ 
          Toast.makeText(MainActivity.this, 
            "Engine capacity is chosen", Toast.LENGTH_LONG).show(); 
         } 
        } 
       } 
     ); 
     check4 = (CheckBox)findViewById(checkBoxDegviela); 
     check4.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         if (((CheckBox)v).isChecked()){ 
          Toast.makeText(MainActivity.this, 
            "Gas consumption is chosen", Toast.LENGTH_LONG).show(); 
         } 
        } 
       } 
     ); 
     check5 = (CheckBox)findViewById(checkBoxNobraukums); 
     check5.setOnClickListener(
       new View.OnClickListener() { 
        @Override 
        public void onClick(View v) { 
         if (((CheckBox)v).isChecked()){ 
          Toast.makeText(MainActivity.this, 
            "Mileage is chosen", Toast.LENGTH_LONG).show(); 
         } 
        } 
       } 
     ); 

    } 



}

这是activity_main.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="todo.raitis.com.carchooser.MainActivity"> 

    <CheckBox 
     android:text="Price" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/checkBoxPrice" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="67dp" /> 

    <CheckBox 
     android:text="Year" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/checkBoxPrice" 
     android:layout_alignRight="@+id/checkBoxPrice" 
     android:layout_alignEnd="@+id/checkBoxPrice" 
     android:layout_marginTop="33dp" 
     android:id="@+id/checkBoxYear" /> 

    <CheckBox 
     android:text="Engine Capacity" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="37dp" 
     android:id="@+id/checkBoxCapacity" 
     android:layout_below="@+id/checkBoxYear" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <CheckBox 
     android:text="Gas" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/checkBoxCapacity" 
     android:layout_alignRight="@+id/checkBoxCapacity" 
     android:layout_alignEnd="@+id/checkBoxCapacity" 
     android:layout_marginTop="30dp" 
     android:id="@+id/checkBoxGas" /> 

    <CheckBox 
     android:text="Mileage" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/checkBoxGas" 
     android:layout_alignRight="@+id/checkBoxGas" 
     android:layout_alignEnd="@+id/checkBoxGas" 
     android:layout_marginTop="33dp" 
     android:id="@+id/checkBoxMileage" /> 

    <Button 
     android:text="Next" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentBottom="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginBottom="31dp" 
     android:id="@+id/button" /> 

    <TextView 
     android:text="Choose criteria!" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="8dp" 
     android:id="@+id/textView" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 
</RelativeLayout>

这是SecondActivity.java：

package todo.beginner.com.carchooser2; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 

public class SecondActivity extends AppCompatActivity { 

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

这是从activity_second.xml：

<?xml version="1.0" encoding="utf-8"?> 
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginTop="10dp"> 

    <TableRow 
     android:background="#607D8B" 
     android:padding="5dp"> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Car Name" /> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Price" /> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Year" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Gas" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Mileage" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Capacity" /> 
    </TableRow> 

    <TableRow 
     android:background="#ECEFF1" 
     android:padding="5dp"> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="Audi" /> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="5000" /> 
     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="2001" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="7" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="280000" /> 
    <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:text="2.5" /> 
    </TableRow> 
</TableLayout>

来源

2016-12-06 TotalAndroidBeginner

您能否替换Intent intent = new Intent（“todo.beginner.com.SecondActivity”）; Intent intent = new Intent（MainActivity.this，SecondActivity.class）; – Rahil2952

您正在错误地使用该意图。它应该是：

Intent intent = new Intent(MainActivity.this,SecondActivity.class); 
startActivity(intent);

来源

2016-12-06 21:13:47 emhomm4

不要以为你正常启动活动。尝试在MainActivity中更改Intent intent = new Intent("todo.beginner.com.SecondActivity");至Intent intent = new Intent(MainActivity.this, SecondActivity.class);。

来源

2016-12-06 21:11:13 crymson

内容没有显示

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