项目截图
1 <?xml version="1.0" encoding="utf-8"?> 2 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:app="http://schemas.android.com/apk/res-auto" 4 xmlns:tools="http://schemas.android.com/tools" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent" 7 tools:context=".MainActivity"> 8 9 <TextView 10 android:id="@+id/textView" 11 android:layout_width="wrap_content" 12 android:layout_height="wrap_content" 13 android:text="大家好，祝我们成功！" 14 android:textSize="24sp" 15 app:layout_constraintBottom_toBottomOf="parent" 16 app:layout_constraintLeft_toLeftOf="parent" 17 app:layout_constraintRight_toRightOf="parent" 18 app:layout_constraintTop_toTopOf="parent" /> 19 20 <Button 21 android:id="@+id/button" 22 android:layout_width="wrap_content" 23 android:layout_height="wrap_content" 24 android:text="改变字体颜色" 25 app:layout_constraintBottom_toBottomOf="parent" 26 app:layout_constraintEnd_toEndOf="parent" 27 app:layout_constraintHorizontal_bias="0.498" 28 app:layout_constraintStart_toStartOf="parent" 29 app:layout_constraintTop_toTopOf="parent" 30 app:layout_constraintVertical_bias="0.6" /> 31 32 </android.support.constraint.ConstraintLayout> activitty_main.xml 1 <?xml version="1.0" encoding="utf-8"?> 2 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:app="http://schemas.android.com/apk/res-auto" 4 xmlns:tools="http://schemas.android.com/tools" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent" 7 tools:context=".ColorActivity"> 8 9 <ListView 10 android:id="@+id/listView" 11 android:layout_width="match_parent" 12 android:layout_height="match_parent" /> 13 </android.support.constraint.ConstraintLayout> activity_color.xml 1 package com.example.selectcolor; 2 3 import android.content.Intent; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.view.View; 7 import android.widget.AdapterView; 8 import android.widget.ArrayAdapter; 9 import android.widget.ListView; 10 import android.widget.Toast; 11 12 public class ColorActivity extends AppCompatActivity { 13 14 private ListView listView; 15 16 @Override 17 protected void onCreate(Bundle savedInstanceState) { 18 super.onCreate(savedInstanceState); 19 setContentView(R.layout.activity_color); 20 String[] data = {"红色","绿色","蓝色","黑色","灰色"}; 21 listView = (ListView)findViewById(R.id.listView); 22 final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, data); 23 listView.setAdapter(arrayAdapter); 24 25 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 26 @Override 27 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 28 Intent intent = new Intent(); 29 String Color = arrayAdapter.getItem(position); 30 intent.putExtra("color",Color); 31 setResult(1,intent); 32 finish(); 33 } 34 }); 35 } 36 } ColorActivity.java 1 package com.example.selectcolor; 2 3 import android.content.Intent; 4 import android.graphics.Color; 5 import android.support.annotation.Nullable; 6 import android.support.v7.app.AppCompatActivity; 7 import android.os.Bundle; 8 import android.view.View; 9 import android.widget.Button; 10 import android.widget.EditText; 11 import android.widget.TextView; 12 13 public class MainActivity extends AppCompatActivity { 14 15 private Button button; 16 private TextView textView; 17 @Override 18 protected void onCreate(Bundle savedInstanceState) { 19 super.onCreate(savedInstanceState); 20 setContentView(R.layout.activity_main); 21 button = (Button)findViewById(R.id.button); 22 textView = (TextView)findViewById(R.id.textView); 23 button.setOnClickListener(new View.OnClickListener() { 24 @Override 25 public void onClick(View v) { 26 Intent intent = new Intent(MainActivity.this, ColorActivity.class); 27 startActivityForResult(intent,1); 28 } 29 }); 30 } 31 32 @Override 33 protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { 34 super.onActivityResult(requestCode, resultCode, data); 35 if(requestCode==1 && resultCode==1){ 36 String color = data.getStringExtra("color"); 37 switch (color){ 38 case "红色": 39 textView.setTextColor(Color.RED); 40 break; 41 case "绿色": 42 textView.setTextColor(Color.GREEN); 43 break; 44 case "蓝色": 45 textView.setTextColor(Color.BLUE); 46 break; 47 case "黑色": 48 textView.setTextColor(Color.BLACK); 49 break; 50 case "灰色": 51 textView.setTextColor(Color.GRAY); 52 break; 53 } 54 } 55 } 56 } MainActivity.java
转载于:https://www.cnblogs.com/jdxb/p/10929786.html
