我有一个包含500个文本的xml文件。我有一个按钮随机播放并显示它。 我想为下一个和后一个添加两个按钮。采取每一个空间。 这是我的rando按钮代码。
final TextView tv = (TextView) findViewById(R.id.quote);
Resources res = getResources();
myString = res.getStringArray(R.array.quote);
String q = myString[rgenerator.nextInt(myString.length)];
tv.setText(q);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
myString = getResources().getStringArray(R.array.quote);
String q = myString[rgenerator.nextInt(myString.length)];
tv.setText(q);
}
});
}
这些按钮的代码是什么？谢谢
所有代码：
import java.util.Random;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdView;
public class MainActivity extends ActionBarActivity {
Context context;
private String[] myString;
private static final Random rgenerator = new Random();
private AdView adView;
int index = 0;
private static final String AD_UNIT_ID = "ca-app-pub-7628432187347131/3277094808";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().hide();
// Create an ad.
adView = new AdView(this);
adView.setAdSize(AdSize.SMART_BANNER);
adView.setAdUnitId(AD_UNIT_ID);
context = this;
LinearLayout layout = (LinearLayout) findViewById(R.id.ads_lin);
layout.addView(adView);
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.addTestDevice("5B895A3CC0CA50D56506E300A4C8342B")
.addTestDevice("D039292A1F434C999B21503D63D6FD88")
.addTestDevice("TEST_EMULATOR").build();
// Start loading the ad in the background.
adView.loadAd(adRequest);
// Start loading the ad in the background.
final TextView tv = (TextView) findViewById(R.id.quote);
Resources res = getResources();
myString = res.getStringArray(R.array.quote);
String q = myString[rgenerator.nextInt(myString.length)];
tv.setText(q);
Button btn = (Button) findViewById(R.id.btn);
Button btnNext = (Button) findViewById(R.id.btnNext);
Button btnPreview = (Button) findViewById(R.id.btnPreview);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
myString = getResources().getStringArray(R.array.quote);
index = rgenerator.nextInt(myString.length);
String q = myString[index];
tv.setText(q);
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String q = myString[index++];
tv.setText(q);
}
});
btnPreview.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
String q = myString[index--];
tv.setText(q);
}
});
}
@Override
public void onResume() {
super.onResume();
if (adView != null) {
adView.resume();
}
}
@Override
public void onPause() {
if (adView != null) {
adView.pause();
}
super.onPause();
}
/** Called before the activity is destroyed. */
@Override
public void onDestroy() {
// Destroy the AdView.
if (adView != null) {
adView.destroy();
}
super.onDestroy();
}
}
没有错误，但是当我运行应用程序时，它就停止了。
这是logcat：
09-20 17:24:53.341: E/dalvikvm(7651): adjustAdaptiveCoef max=6291456, min=1572864, ut=568
09-20 17:24:54.152: E/AndroidRuntime(7651): FATAL EXCEPTION: main
09-20 17:24:54.152: E/AndroidRuntime(7651): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.stiaica/com.example.stiaica.MainActivity}: java.lang.ClassCastException: android.widget.ImageView cannot be cast to android.widget.Button
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2299)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread.access$700(ActivityThread.java:150)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.os.Handler.dispatchMessage(Handler.java:99)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.os.Looper.loop(Looper.java:137)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread.main(ActivityThread.java:5283)
09-20 17:24:54.152: E/AndroidRuntime(7651): at java.lang.reflect.Method.invokeNative(Native Method)
09-20 17:24:54.152: E/AndroidRuntime(7651): at java.lang.reflect.Method.invoke(Method.java:511)
09-20 17:24:54.152: E/AndroidRuntime(7651): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
09-20 17:24:54.152: E/AndroidRuntime(7651): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
09-20 17:24:54.152: E/AndroidRuntime(7651): at dalvik.system.NativeStart.main(Native Method)
09-20 17:24:54.152: E/AndroidRuntime(7651): Caused by: java.lang.ClassCastException: android.widget.ImageView cannot be cast to android.widget.Button
09-20 17:24:54.152: E/AndroidRuntime(7651): at com.example.stiaica.MainActivity.onCreate(MainActivity.java:59)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.Activity.performCreate(Activity.java:5283)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
09-20 17:24:54.152: E/AndroidRuntime(7651): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
09-20 17:24:54.152: E/AndroidRuntime(7651): ... 11 more
09-20 17:24:54.252: E/GooglePlayServicesUtil(7651): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
我尝试使用Activity更改ActionBarActivity，但会出现更多错误。
现在正在工作，按钮正常工作。但是有一个问题，当我到达最后的传票时，我按下一个按钮，应用程序停止了。同样的事情是第一次发送。
logcat的：
09-20 18:08:56.915: E/dalvikvm(20667): adjustAdaptiveCoef max=4194304, min=1048576, ut=568
09-20 18:08:58.937: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:08:59.508: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:08:59.548: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:08:59.568: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:09:31.949: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:09:32.020: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:09:32.040: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:09:32.040: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:03.740: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:03.841: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:03.861: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:03.871: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:34.871: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:34.931: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:34.961: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:34.961: E/GooglePlayServicesUtil(20667): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
09-20 18:10:40.226: E/AndroidRuntime(20667): FATAL EXCEPTION: main
09-20 18:10:40.226: E/AndroidRuntime(20667): java.lang.ArrayIndexOutOfBoundsException: length=593; index=593
09-20 18:10:40.226: E/AndroidRuntime(20667): at com.example.stiaica.MainActivity$2.onClick(MainActivity.java:73)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.view.View.performClick(View.java:4432)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.view.View$PerformClick.run(View.java:18338)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.os.Handler.handleCallback(Handler.java:725)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.os.Handler.dispatchMessage(Handler.java:92)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.os.Looper.loop(Looper.java:137)
09-20 18:10:40.226: E/AndroidRuntime(20667): at android.app.ActivityThread.main(ActivityThread.java:5283)
09-20 18:10:40.226: E/AndroidRuntime(20667): at java.lang.reflect.Method.invokeNative(Native Method)
09-20 18:10:40.226: E/AndroidRuntime(20667): at java.lang.reflect.Method.invoke(Method.java:511)
09-20 18:10:40.226: E/AndroidRuntime(20667): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
09-20 18:10:40.226: E/AndroidRuntime(20667): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
09-20 18:10:40.226: E/AndroidRuntime(20667): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：0)
您需要将生成的随机数存储在索引变量中，如此
移动下一个增量变量
向后移动
修改
以下是如何操作：
public class MainActivity extends Activity {
final int index = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final TextView tv = (TextView) findViewById(R.id.quote);
Resources res = getResources();
final myString = res.getStringArray(R.array.quote);
final String q = myString[rgenerator.nextInt(myString.length)];
tv.setText(q);
Button btnNext = (Button) findViewById(R.id.btnNext);
Button btnPrevious = (Button) findViewById(R.id.btnPrevious);
Button btn = (Button) findViewById(R.id.btn);
btnNext.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String q = myString[index++];
tv.setText(q);
}
});
btnPrevious.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String q = myString[index--];
tv.setText(q);
}
});
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
myString = getResources().getStringArray(R.array.quote);
index = rgenerator.nextInt(myString.length);
String q = myString[index];
tv.setText(q);
}
});
}
}}
答案 1 :(得分：0)
将所有文本放入arraylist。随机生成文本。对于下一个和后一个，获取随机生成的文本的位置，并为下一个增加位置+1，并将后退的位置减少1。
查看本文中的评论，它将为您提供如何使用arraylist作为文本的想法。希望它会对你有所帮助。干杯! :) Random text on button click